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; 

width: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))); 

}