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function showDIV()
{
var myDIV =document.getElmentById("myDIV");
if(myDIV == null)
alert('控件没找到');
var leftedge = document.body.clientWidth-event.clientX;
var bottomedge = document.body.clientHeight-event.clientY;
if (leftedge < myDIV.offsetWidth)
{
myDIV.style.left = document.body.scrollLeft + event.clientX - myDIV.offsetWidth;
}
else
{
myDIV.style.left = document.body.scrollLeft + event.clientX;
}
if (bottomedge < myDIV.offsetHeight)
{
myDIV.style.top = document.body.scrollTop + event.clientY - myDIV.offsetHeight;
}
else
{
myDIV.style.top = document.body.scrollTop + event.clientY;
}
myDIV.style.display = "block";
return false;
}