页首固定导航条和页底固定导航条

页首固定导航条

#topNav {

position:fixed;

top:0;

_ position:absolute;

_top:expression_r(eval_r(document.documentElement.scrollTop));

overflow:auto;

z-index:9999;

}

页尾固定导航条

body { background-image:url(about:blank);
background-attachment:fixed; }

#bottomNav {

background-color:#096;

overflow:visible

z-index:999; 

position:fixed; 

bottom:0; 

left:0; 

100%; 

_position:absolute; 
top:expression_r(eval_r(document.documentElement.scrollTop+document.documentElement.clientHeight

-this.offsetHeight

-(parseInt(this.currentStyle.marginTop,10)||0)

-(parseInt(this.currentStyle.marginBottom,10)||0))); 

}