下面这个例子对你有帮助：
<!doctype html public "-//W3C//DTD XHTML 1.0 Transitional//EN" "
http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="
http://www.w3.org/1999/xhtml" lang="gb2312">
<head>
<title> 代码实例：拖动对象 Drag Object (兼容:IE、Firefox、Opera ... )</title>
<meta http-equiv="content-type" content="text/html; charset=gb2312" />
<meta name="keywords" content="代码实例：拖动对象">
<meta name="description" content="最简短的拖动对象代码实例演示">
<style>
.dragAble {position:relative;cursor:move;}
</style>
<script language="javascript">
<!--
var ie=document.all;
var nn6=document.getElementById&&!document.all;
var isdrag=false;
var y,x;
var oDragObj;
function moveMouse(e) {
if (isdrag) {
oDragObj.style.top = (nn6 ? nTY + e.clientY - y : nTY + event.clientY - y)+"px";
oDragObj.style.left = (nn6 ? nTX + e.clientX - x : nTX + event.clientX - x)+"px";
return false;
}
}
function initDrag(e) {
var oDragHandle = nn6 ? e.target : event.srcElement;
var topElement = "HTML";
while (oDragHandle.tagName != topElement && oDragHandle.className != "dragAble") {
oDragHandle = nn6 ? oDragHandle.parentNode : oDragHandle.parentElement;
}
if (oDragHandle.className=="dragAble") {
isdrag = true;
oDragObj = oDragHandle;
nTY = parseInt(oDragObj.style.top+0);
y = nn6 ? e.clientY : event.clientY;
nTX = parseInt(oDragObj.style.left+0);
x = nn6 ? e.clientX : event.clientX;
document.onmousemove=moveMouse;
return false;
}
}
document.onmousedown=initDrag;
document.onmouseup=new Function("isdrag=false");
//-->
</script>
</head>
<body>
<img src="
http://www.iecn.net/images/user_icons/2006/10/01/u_35653.gif"" target="_new">
http://www.iecn.net/images/user_icons/2006/10/01/u_35653.gif"" target="_new">
http://www.iecn.net/images/user_icons/2006/10/01/u_35653.gif"" target="_new">
http://www.iecn.net/images/user_icons/2006/10/01/u_35653.gif" class="dragAble" / onclick="javascript:window.open(this.src);" style="cursor: pointer" alt="点此在新窗口浏览图片" onmousewheel="return bbimg(this)" onload="javascript:resizepic(this)">
<img src="
http://www.iecn.net/images/user_icons/2006/10/01/u_35653.gif"" target="_new">
http://www.iecn.net/images/user_icons/2006/10/01/u_35653.gif"" target="_new">
http://www.iecn.net/images/user_icons/2006/10/01/u_35653.gif"" target="_new">
http://www.iecn.net/images/user_icons/2006/10/01/u_35653.gif" class="dragAble" / onclick="javascript:window.open(this.src);" style="cursor: pointer" alt="点此在新窗口浏览图片" onmousewheel="return bbimg(this)" onload="javascript:resizepic(this)">
<img src="
http://www.iecn.net/images/user_icons/2006/10/01/u_35653.gif"" target="_new">
http://www.iecn.net/images/user_icons/2006/10/01/u_35653.gif"" target="_new">
http://www.iecn.net/images/user_icons/2006/10/01/u_35653.gif"" target="_new">
http://www.iecn.net/images/user_icons/2006/10/01/u_35653.gif" class="dragAble" / onclick="javascript:window.open(this.src);" style="cursor: pointer" alt="点此在新窗口浏览图片" onmousewheel="return bbimg(this)" onload="javascript:resizepic(this)"><br /><br />
<div style="border:1px solid #ff6d00;background:#ffd801;width:240px;padding:5px 0;" class="dragAble">这些都是可拖动对象</div>
</body>
</html>