I explain about drag and drop in JavasScript,
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Untitled Document</title>
<style>
#target
{
margin-top:40px;
margin-left:600px;
width:200px;
height:200px;
border:1px solid #999;
}
</style>
</head>
<body>
<div id="target" ondragover="allowDrop(event)" ondrop="drop(event)"></div>
<img src="img/download.jpg"...
