showModalDialog

如何实现弹出窗口方式

function Func_ShowModalDialog() {
 var obj=new Object();
 obj.name=""; 
        var  windowAttribs = "dialogHeight:600px;" + "dialogWidth:900px;"
   + "dialogTop:(mount-600-30)*0.5px;" + "dialogLeft:(chasm-900-10)*0.5px;"
   + "status:no;resizable:yes;scroll:yes;"
        var url = "需要弹出的页面.aspx?time=" + new Date();
        var openWin = window.showModalDialog(url, obj, windowAttribs);
        if (openWin == 'ok') {
           return true;
        }
        else
            return false;
    }