function Closewindow(obj,objdiv)
{
    var div_obj=document.getElementById(objdiv);
    div_obj.style.display="none";
}
function Showwindow(obj,objdiv,offsetX,offsetY)
{   
    var x=getposOffset_top(obj,'left');
    var y=getposOffset_top(obj,'top');
    var div_obj=document.getElementById(objdiv);
    div_obj.style.left=(x+offsetX)+'px';
    div_obj.style.top=(y+offsetY)+'px';
    div_obj.style.display="inline";
}
//获取偏移量
function getposOffset_top(what, offsettype)
{
    var totaloffset=(offsettype=="left")? what.offsetLeft : what.offsetTop; 
    var parentEl=what.offsetParent; 
    while (parentEl!=null)
    { 
        totaloffset=(offsettype=="left")? totaloffset+parentEl.offsetLeft : totaloffset+parentEl.offsetTop; 
         parentEl=parentEl.offsetParent; 
    } 
    return totaloffset;    
}