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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<title>Examples</title>
<meta name="description" content="">
<meta name="keywords" content="">
<link href="" rel="stylesheet">
<style>
div{float:left;margin:20px;}
#div1{width:100px;height:100px;background: #f00;}
#div2{width:200px;height:200px;background:#ccc;display: none;}
</style>
<script type="text/javascript">
window.onload=function(){
var oDiv1=document.getElementById("div1");
var oDiv2=document.getElementById("div2");
var timer=null;
oDiv1.onmouseover= oDiv2.onmouseover=function(){
clearTimeout(timer);
oDiv2.style.display="block";
}
oDiv1.onmouseout= oDiv2.onmouseout=function(){
timer=setTimeout(function(){
oDiv2.style.display="none";
},500)
}
}
</script>
</head>
<body>
<div id="div1"></div>
<div id="div2"></div>
</body>
</html>