不跳动(除了ie6) 总在最右下角

<mce:script type="text/javascript"><!--
 
window.onresize = window.onscroll = window.onload =function()
{
    var win_w = document.documentElement.clientWidth ;//窗口宽
    var space_w = 0;//左空白宽
    
    if (win_w > 1000)
    {//窗口大于main 有取左边空白
      space_w = (win_w-1000)/2;
    }
    
  if(navigator.userAgent.indexOf("MSIE 6.0")>0)   
  {    
    document.getElementsByTagName('body')[0].style.backgroundAttachment = 'fixed';/*必要，防抖动*/
    $e('top').style.setExpression('top','eval（ (document.compatMode&&document.compatMode=="CSS1Compat")?'
                                      + 'documentElement.scrollTop+documentElement.clientHeight-this.clientHeight-1'
                                      + ':'
                                      + 'document.body.scrollTop+document.body.clientHeight-this.clientHeight-1)' );
    $e('top').style.setExpression('left','eval（ (document.compatMode&&document.compatMode=="CSS1Compat")?'
                                      + 'documentElement.scrollLeft+documentElement.clientWidth-this.clientWidth-1'
                                      + ':'
                                      + 'document.body.scrollLeft+document.body.clientWidth-this.clientWidth-1) -' + space_w );
  }else
   {  
     $e("top").style.right = space_w + 5 + 'px'; //设置空白;
     $e("top").style.bottom = '0px'; //设置下边对齐;
   }
}
function $e(objId) 
{ 
  return document.getElementById(objId); 
} 
// --></mce:script>
配合
#top{
position:fixed !important;/*ie7 ff*/
position:absolute;
z-index:999;
bottom:0px;
} 
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