var doCenter = {   
    displayDiv : function (elementid)
    { 
    var timer;
    var ie=document.all && !window.opera ;
    var dom=document.getElementById ;
    iebody=(document.compatMode=="CSS1Compat")? document.documentElement : document.body ;
    objref=(dom)? document.getElementById(elementid) : document.all[elementid] ;
    var scroll_top=(ie)? iebody.scrollTop : window.pageYOffset ;
    var docwidth=(ie)? iebody.clientWidth : window.innerWidth ;
    docheight=(ie)? iebody.clientHeight: window.innerHeight ;
    var objwidth=objref.offsetWidth ;
    objheight=objref.offsetHeight ;
    //objref.style.left=docwidth/2-objwidth/2+"px" ;
    objref.style.top=scroll_top+docheight/2-objheight/2+"px" ;
    timer=setTimeout("doCenter.displayDiv('"+elementid+"')",1)
    },
   
    initcenter : function (elementid) {
    if (window.attachEvent)
    window.attachEvent("onload", doCenter.displayDiv(elementid)) ;
    else if (document.getElementById)
    window.onload=doCenter.displayDiv(elementid) ;
    }
}