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演示效果：

js 代码：

//QQ:272912705 光之翼 www.hi.baidu.com/jcomet

if(!Array.prototype.push)
{
Array.prototype.push=function()
{
    var startLength=this.length;
    for(var i=0;i<arguments.length;i++)this[startLength+i]=arguments[i];
    return this.length
}
};
function G()
{
var elements=new Array();
for(var i=0;i<arguments.length;i++)
{
    var element=arguments[i];
    if(typeof element=='string')element=document.getElementById(element);
    if(arguments.length==1)return element;
    elements.push(element)
};
return elements
};
Function.prototype.bind=function(object)
{
var __method=this;
return function()
{
__method.apply(object,arguments)
}
};
Function.prototype.bindAsEventListener=function(object)
{
var __method=this;
return function(event)
{
__method.call(object,event||window.event)
}
};
Object.extend=function(destination,source)
{
for(property in source)
{
destination[property]=source[property]
};
return destination
};
if(!window.Event)
{
var Event=new Object()
};
Object.extend(Event,
{
observers:false,element:function(event)
{
return event.target||event.srcElement
}
,isLeftClick:function(event)
{
return(((event.which)&&(event.which==1))||((event.button)&&(event.button==1)))
}
,pointerX:function(event)
{
return event.pageX||(event.clientX+(document.documentElement.scrollLeft||document.body.scrollLeft))
}
,pointerY:function(event)
{
return event.pageY||(event.clientY+(document.documentElement.scrollTop||document.body.scrollTop))
}
,stop:function(event)
{
if(event.preventDefault)
{
    event.preventDefault();
    event.stopPropagation()
}
else
{
    event.returnValue=false;
    event.cancelBubble=true
}
}
,findElement:function(event,tagName)
{
var element=Event.element(event);
while(element.parentNode&&(!element.tagName||(element.tagName.toUpperCase()!=tagName.toUpperCase())))element=element.parentNode;
return element
}
,_observeAndCache:function(element,name,observer,useCapture)
{
if(!this.observers)this.observers=[];
if(element.addEventListener)
{
    this.observers.push([element,name,observer,useCapture]);
    element.addEventListener(name,observer,useCapture)
}
else if(element.attachEvent)
{
    this.observers.push([element,name,observer,useCapture]);
    element.attachEvent('on'+name,observer)
}
}
,unloadCache:function()
{
if(!Event.observers)return;
for(var i=0;i<Event.observers.length;i++)
{
    Event.stopObserving.apply(this,Event.observers[i]);
    Event.observers[i][0]=null
};
Event.observers=false
}
,observe:function(element,name,observer,useCapture)
{
var element=G(element);
useCapture=useCapture||false;
if(name=='keypress'&&(navigator.appVersion.match(/Konqueror|Safari|KHTML/)||element.attachEvent))name='keydown';
this._observeAndCache(element,name,observer,useCapture)
}
,stopObserving:function(element,name,observer,useCapture)
{
var element=G(element);
useCapture=useCapture||false;
if(name=='keypress'&&(navigator.appVersion.match(/Konqueror|Safari|KHTML/)||element.detachEvent))name='keydown';
if(element.removeEventListener)
{
    element.removeEventListener(name,observer,useCapture)
}
else if(element.detachEvent)
{
    element.detachEvent('on'+name,observer)
}
}
}
);
Event.observe(window,'unload',Event.unloadCache,false);
var Class=function()
{
var _class=function()
{
this.initialize.apply(this,arguments)
};
for(i=0;i<arguments.length;i++)
{
superClass=arguments[i];
for(member in superClass.prototype)
{
    _class.prototype[member]=superClass.prototype[member]
}
};
_class.child=function()
{
return new Class(this)
};
_class.extend=function(f)
{
for(property in f)
{
    _class.prototype[property]=f[property]
}
};
return _class
};
function space(flag)
{
if(flag=="begin")
{
    var ele=document.getElementById("ft");
    if(typeof(ele)!="undefined"&&ele!=null)ele.id="ft_popup";
    ele=document.getElementById("usrbar");
    if(typeof(ele)!="undefined"&&ele!=null)ele.id="usrbar_popup"
}
else if(flag=="end")
{
    var ele=document.getElementById("ft_popup");
    if(typeof(ele)!="undefined"&&ele!=null)ele.id="ft";
    ele=document.getElementById("usrbar_popup");
    if(typeof(ele)!="undefined"&&ele!=null)ele.id="usrbar"
}
};
var Popup=new Class();
Popup.prototype=
{
iframeIdName:'ifr_popup',initialize:function(config)
{
    this.config=Object.extend(
    {
      contentType:1,isHaveTitle:true,scrollType:'yes',isBackgroundCanClick:false,isSupportDraging:true,isShowShadow:false,isReloadOnClose:false,400,height:300
    }
    ,config||
    {
    }
    );
    this.info=
    {
      shadowWidth:4,title:"",contentUrl:"",contentHtml:"",callBack:null,parameter:null,confirmCon:"",alertCon:"",someHiddenTag:"select,object,embed",someDisabledBtn:"",someHiddenEle:"",overlay:0,coverOpacity:40
    };
    this.color=
    {
      cColor:"#EEEEEE",bColor:"#FFFFFF",tColor:"#709CD2",wColor:"#FFFFFF"
    };
    this.dropClass=null;
    this.someToHidden=[];
    this.someToDisabled=[];
    if(!this.config.isHaveTitle)this.config.isSupportDraging=false;
    this.iniBuild()
}
,setContent:function(arrt,val)
{
    if(val!='')
    {
      switch(arrt)
      {
        case 'width':this.config.width=val;
        break;
        case 'height':this.config.height=val;
        break;
        case 'title':this.info.title=val;
        break;
        case 'contentUrl':this.info.contentUrl=val;
        break;
        case 'contentHtml':this.info.contentHtml=val;
        break;
        case 'callBack':this.info.callBack=val;
        break;
        case 'parameter':this.info.parameter=val;
        break;
        case 'confirmCon':this.info.confirmCon=val;
        break;
        case 'alertCon':this.info.alertCon=val;
        break;
        case 'someHiddenTag':this.info.someHiddenTag=val;
        break;
        case 'someHiddenEle':this.info.someHiddenEle=val;
        break;
        case 'someDisabledBtn':this.info.someDisabledBtn=val;
        break;
        case 'overlay':this.info.overlay=val
      }
    }
}
,iniBuild:function()
{
    G('dialogCase')?G('dialogCase').parentNode.removeChild(G('dialogCase')):function()
    {
    };
    var oDiv=document.createElement('span');
    oDiv.id='dialogCase';
    document.body.appendChild(oDiv)
}
,build:function()
{
    var baseZIndex=10001+this.info.overlay*10;
    var showZIndex=baseZIndex+2;
    this.iframeIdName='ifr_popup'+this.info.overlay;
    var path="images/baidu/";
    var close='<input type="image" id="dialogBoxClose" src="'+path+'dialogclose.gif" border="0" width="16" height="16" align="absmiddle" title="关闭"/>';
    var cB='filter: alpha(opacity='+this.info.coverOpacity+');opacity:'+this.info.coverOpacity/100+';';
    var cover='<div id="dialogBoxBG" style="position:absolute;top:0px;left:0px;100%;height:100%;z-index:'+baseZIndex+';'+cB+'background-color:'+this.color.cColor+';display:none;"></div>';
    var mainBox='<div id="dialogBox" style="border:1px solid '+this.color.tColor+';display:none;z-index:'+showZIndex+';position:relative;'+this.config.width+'px;"><table width="100%" border="0" cellpadding="0" cellspacing="0" bgcolor="'+this.color.bColor+'">';
    if(this.config.isHaveTitle)
    {
      mainBox+='<tr height="24" bgcolor="'+this.color.tColor+'"><td><table style="-moz-user-select:none;height:24px;" width="100%" border="0" cellpadding="0" cellspacing="0" ><tr>'+'<td width="6" height="24"></td><td id="dialogBoxTitle" style="color:'+this.color.wColor+';font-size:14px;font-weight:bold;">'+this.info.title+'&nbsp;</td>'+'<td id="dialogClose" width="20" align="right" valign="middle">'+close+'</td><td width="6"></td></tr></table></td></tr>'
    }
    else
    {
      mainBox+='<tr height="10"><td align="right">'+close+'</td></tr>'
    };
    mainBox+='<tr style="height:'+this.config.height+'px" valign="top"><td id="dialogBody" style="position:relative;"></td></tr></table></div>'+'<div id="dialogBoxShadow" style="display:none;z-index:'+baseZIndex+';"></div>';
    if(!this.config.isBackgroundCanClick)
    {
      G('dialogCase').innerHTML=cover+mainBox;
      G('dialogBoxBG').style.height=document.body.scrollHeight
    }
    else G('dialogCase').innerHTML=mainBox;
    Event.observe(G('dialogBoxClose'),"click",this.reset.bindAsEventListener(this),false);
    if(this.config.isSupportDraging)
    {
      dropClass=new Dragdrop(this.config.width,this.config.height,this.info.shadowWidth,this.config.isSupportDraging,this.config.contentType);
      G("dialogBoxTitle").style.cursor="move"
    };
    this.lastBuild()
}
,lastBuild:function()
{
    var confirm='<div style="100%;height:100%;text-align:center;"><div style="margin:20px 20px 0 20px;font-size:14px;line-height:16px;color:#000000;">'+this.info.confirmCon+'</div><div style="margin:20px;"><input id="dialogOk" type="button" value=" 确定 "/>&nbsp;<input id="dialogCancel" type="button" value=" 取消 "/></div></div>';
    var alert='<div style="100%;height:100%;text-align:center;"><div style="margin:20px 20px 0 20px;font-size:14px;line-height:16px;color:#000000;">'+this.info.alertCon+'</div><div style="margin:20px;"><input id="dialogYES" type="button" value=" 确定 "/></div></div>';
    var baseZIndex=10001+this.info.overlay*10;
    var coverIfZIndex=baseZIndex+4;
    if(this.config.contentType==1)
    {
      var openIframe="<iframe width='100%' style='height:"+this.config.height+"px' name='"+this.iframeIdName+"' id='"+this.iframeIdName+"' src='"+this.info.contentUrl+"' frameborder='0' scrolling='"+this.config.scrollType+"'></iframe>";
      var coverIframe="<div id='iframeBG' style='position:absolute;top:0px;left:0px;1px;height:1px;z-index:"+coverIfZIndex+";filter: alpha(opacity=00);opacity:0.00;background-color:#ffffff;'><div>";
      G("dialogBody").innerHTML=openIframe+coverIframe
    }
    else if(this.config.contentType==2)
    {
      G("dialogBody").innerHTML=this.info.contentHtml
    }
    else if(this.config.contentType==3)
    {
      G("dialogBody").innerHTML=confirm;
      Event.observe(G('dialogOk'),"click",this.forCallback.bindAsEventListener(this),false);
      Event.observe(G('dialogCancel'),"click",this.close.bindAsEventListener(this),false)
    }
    else if(this.config.contentType==4)
    {
      G("dialogBody").innerHTML=alert;
      Event.observe(G('dialogYES'),"click",this.close.bindAsEventListener(this),false)
    }
}
,reBuild:function()
{
    G('dialogBody').height=G('dialogBody').clientHeight;
    this.lastBuild()
}
,show:function()
{
    this.hiddenSome();
    this.middle();
    if(this.config.isShowShadow)this.shadow()
}
,forCallback:function()
{
    return this.info.callBack(this.info.parameter)
}
,shadow:function()
{
    var oShadow=G('dialogBoxShadow');
    var oDialog=G('dialogBox');
    oShadow['style']['position']="absolute";
    oShadow['style']['background']="#000";
    oShadow['style']['display']="";
    oShadow['style']['opacity']="0.2";
    oShadow['style']['filter']="alpha(opacity=20)";
    oShadow['style']['top']=oDialog.offsetTop+this.info.shadowWidth;
    oShadow['style']['left']=oDialog.offsetLeft+this.info.shadowWidth;
    oShadow['style']['width']=oDialog.offsetWidth;
    oShadow['style']['height']=oDialog.offsetHeight
}
,middle:function()
{
    if(!this.config.isBackgroundCanClick)G('dialogBoxBG').style.display='';
    var oDialog=G('dialogBox');
    oDialog['style']['position']="absolute";
    oDialog['style']['display']='';
    var sClientWidth=document.body.clientWidth;
    var sClientHeight=document.body.clientHeight;
    var sScrollTop=document.body.scrollTop;
    var sleft=(document.body.clientWidth/2)-(oDialog.offsetWidth/2);
    var iTop=-20+(sClientHeight/2+sScrollTop)-(oDialog.offsetHeight/2);
    var sTop=iTop>0?iTop:(sClientHeight/2+sScrollTop)-(oDialog.offsetHeight/2);
    if(sTop<1)sTop="20";
    if(sleft<1)sleft="20";
    oDialog['style']['left']=sleft+"px";
    oDialog['style']['top']=sTop+"px";
}
,reset:function()
{
    if(this.config.isReloadOnClose)
    {
      top.location.reload()
    };
    this.close()
}
,close:function()
{
    G('dialogBox').style.display='none';
    if(!this.config.isBackgroundCanClick)G('dialogBoxBG').style.display='none';
    if(this.config.isShowShadow)G('dialogBoxShadow').style.display='none';
    G('dialogBody').innerHTML='';
    this.showSome()
}
,hiddenSome:function()
{
    var tag=this.info.someHiddenTag.split(",");
    if(tag.length==1&&tag[0]=="")tag.length=0;
    for(var i=0;i<tag.length;i++)
    {
      this.hiddenTag(tag[i])
    };
    var ids=this.info.someHiddenEle.split(",");
    if(ids.length==1&&ids[0]=="")ids.length=0;
    for(var i=0;i<ids.length;i++)
    {
      this.hiddenEle(ids[i])
    };
    var ids=this.info.someDisabledBtn.split(",");
    if(ids.length==1&&ids[0]=="")ids.length=0;
    for(var i=0;i<ids.length;i++)
    {
      this.disabledBtn(ids[i])
    };
    space("begin")
}
,disabledBtn:function(id)
{
    var ele=document.getElementById(id);
    if(typeof(ele)!="undefined"&&ele!=null&&ele.disabled==false)
    {
      ele.disabled=true;
      this.someToDisabled.push(ele)
    }
}
,hiddenTag:function(tagName)
{
    var ele=document.getElementsByTagName(tagName);
    if(ele!=null)
    {
      for(var i=0;i<ele.length;i++)
      {
        if(ele[i].style.display!="none"&&ele[i].style.visibility!='hidden')
        {
          ele[i].style.visibility='hidden';
          this.someToHidden.push(ele[i])
        }
      }
    }
}
,hiddenEle:function(id)
{
    var ele=document.getElementById(id);
    if(typeof(ele)!="undefined"&&ele!=null)
    {
      ele.style.visibility='hidden';
      this.someToHidden.push(ele)
    }
}
,showSome:function()
{
    for(var i=0;i<this.someToHidden.length;i++)
    {
      this.someToHidden[i].style.visibility='visible'
    };
    for(var i=0;i<this.someToDisabled.length;i++)
    {
      this.someToDisabled[i].disabled=false
    };
    space("end")
}
};
var Dragdrop=new Class();
Dragdrop.prototype=
{
initialize:function(width,height,shadowWidth,showShadow,contentType)
{
    this.dragData=null;
    this.dragDataIn=null;
    this.backData=null;
    this.width=width;
    this.height=height;
    this.shadowWidth=shadowWidth;
    this.showShadow=showShadow;
    this.contentType=contentType;
    this.IsDraging=false;
    this.oObj=G('dialogBox');
    Event.observe(G('dialogBoxTitle'),"mousedown",this.moveStart.bindAsEventListener(this),false)
}
,moveStart:function(event)
{
    this.IsDraging=true;
    if(this.contentType==1)
    {
      G("iframeBG").style.display="";
      G("iframeBG").style.width=this.width+"px";
      G("iframeBG").style.height=this.height+"px";
    };
    Event.observe(document,"mousemove",this.mousemove.bindAsEventListener(this),false);
    Event.observe(document,"mouseup",this.mouseup.bindAsEventListener(this),false);
    Event.observe(document,"selectstart",this.returnFalse,false);
    this.dragData=
    {
      x:Event.pointerX(event),y:Event.pointerY(event)
    };
    this.backData=
    {
      x:parseInt(this.oObj.style.left)+"px",y:parseInt(this.oObj.style.top)+"px"
    }
}
,mousemove:function(event)
{
    if(!this.IsDraging)return;
    var iLeft=Event.pointerX(event)-this.dragData["x"]+parseInt(this.oObj.style.left);
    var iTop=Event.pointerY(event)-this.dragData["y"]+parseInt(this.oObj.style.top);
    if(this.dragData["y"]<parseInt(this.oObj.style.top))iTop=iTop-12;
    else if(this.dragData["y"]>parseInt(this.oObj.style.top)+25)iTop=iTop+12;
    this.oObj.style.left=iLeft+"px";
    this.oObj.style.top=iTop+"px";
    if(this.showShadow)
    {
      G('dialogBoxShadow').style.left=iLeft+this.shadowWidth+"px";
      G('dialogBoxShadow').style.top=iTop+this.shadowWidth+"px";
    };
    this.dragData=
    {
      x:Event.pointerX(event),y:Event.pointerY(event)
    };
    document.body.style.cursor="move"
}
,mouseup:function(event)
{
    if(!this.IsDraging)return;
    if(this.contentType==1)G("iframeBG").style.display="none";
    document.onmousemove=null;
    document.onmouseup=null;
    var mousX=Event.pointerX(event)-(document.documentElement.scrollLeft||document.body.scrollLeft);
    var mousY=Event.pointerY(event)-(document.documentElement.scrollTop||document.body.scrollTop);
    if(mousX<1||mousY<1||mousX>document.body.clientWidth||mousY>document.body.clientHeight)
    {
      this.oObj.style.left=this.backData["x"]+"px";
      this.oObj.style.top=this.backData["y"]+"px";
      if(this.showShadow)
      {
        G('dialogBoxShadow').style.left=this.backData.x+this.shadowWidth+"px";
        G('dialogBoxShadow').style.top=this.backData.y+this.shadowWidth+"px";
      }
    };
    this.IsDraging=false;
    document.body.style.cursor="";
    Event.stopObserving(document,"selectstart",this.returnFalse,false)
}
,returnFalse:function()
{
    return false
}
};
后台代码 ：

<script language=javascript type="text/javascript">
        function openaddcat(url)
        {
      g_pop=new Popup({ contentType:1,scrollType:'yes',610, height:250 });
      g_pop.setContent("title","iframe框架示例");
      g_pop.setContent("contentUrl",url);
      g_pop.build();
      g_pop.show();
     }
   
        function ShowHtmlString()
        {
            var strHtml = "<table border=1 style='90%; text-align:center;'><tr style='height:40px'><td>ds</td><td>dads</td></tr><tr style='height:40px'><td>dadas</td><td>dasd</td></tr><tr style='height:40px'><td>dadasd</td><td>dsadads</td></tr></table>";
            var pop=new Popup({ contentType:2,isReloadOnClose:false,340,height:300});
            pop.setContent("contentHtml",strHtml);
            pop.setContent("title","html字符串示例");
            pop.build();
            pop.show();
        }
        function ShowConfirm()
        {
            var pop=new Popup({ contentType:3,isReloadOnClose:false,340,height:80});
            pop.setContent("title","confirm对话框示例");
            pop.setContent("confirmCon","confirm对话框的内容");
            pop.setContent("callBack",ShowCallBack);
            pop.setContent("parameter",{id:"divCall",str:"点击确定后显示的字符串",obj:pop});
            pop.build();
            pop.show();
        }
        function ShowAlert()
        {
            var pop=new Popup({ contentType:4,isReloadOnClose:false,340,height:80});
            pop.setContent("title","alert警告框示例");
            pop.setContent("alertCon","alert对话框的内容");
            pop.build();
            pop.show();
        }       
      
        function ShowCallBack(para)
        {
            var o_pop = para["obj"]
            var obj = document.getElementById(para["id"]);
            o_pop.close();
            obj.innerText = para["str"];
          
        }       

    </script>