动态添加div

function ajaxButton(th) {
$("#buttonDiv").remove();
var id = th.id;
var leftpx =getAbsoluteLeftPx(id)+$("#"+id).width()+2;
var toppx =getAbsoluteTopPx(id)+$("#"+id).height()+2;
newDiv=document.createElement("div");//创建div
newDiv.style.position="absolute";//relative
newDiv.style.backgroundColor="pink";
//newDiv.style.height="200px";
//newDiv.style.width="212px";
newDiv.id="buttonDiv";
// newDiv.style.border="#ffff00 2px solid";
newDiv.style.top=(toppx-50)+"px";
newDiv.style.left=leftpx+"px";
newDiv.style.fontSize="12px";
newDiv.style.lineHeight="25px"
newDiv.style.padding="5px"
newDiv.style.zIndex="100"
newDiv.style.visibility ="visible";//hidden
newDiv.style.opacity="0.5";
newDiv.style.filter="alpha(opacity=50)"
// newDiv.innerHTML="abcds";
document.body.appendChild(newDiv);//把创建好的div插入到body节点后，否则newDiv会处于游离状态，无法显示；

}

function getAbsoluteLeftPx(objectId) //获取控件的绝对左起位置
{
o = document.getElementById(objectId)
oLeft = o.offsetLeft
while(o.offsetParent!=null) {
oParent = o.offsetParent
oLeft += oParent.offsetLeft
o = oParent
}
return oLeft
}

function getAbsoluteTopPx(objid) //获取控件的绝对上起位置
{
o = document.getElementById(objid);
oTop = o.offsetTop;
while(o.offsetParent!=null)
{
oParent = o.offsetParent
oTop += oParent.offsetTop
o = oParent
}
return oTop
}