兼容浏览器(IE,火狐,谷歌)js实现拖拽效果从<http://www.jb51.net/article/38034.htm>转载

<script language="javascript" type="text/javascript"> 

	var isDrag = false; 
	function isIE(){ 
		if(navigator.userAgent.indexOf("MSIE")>0){
			return true;
		}else{
			return false;
		} 
	} 
	function addListener(element,e,fn){ 
		if(isIE()){
			element.attachEvent("on" + e,fn);
		}else{
			element.addEventListener(e,fn,false);
		} 
	} 
	function drag(e){ 
	
		var e = e || window.event;
		
		var element = e.srcElement || e.target; 
		
		if(e.preventDefault){
			e.preventDefault(); 
		}else{
			e.returnvalue=false;
		} 
		
		isDrag = true; 
		
		var relLeft = e.clientX - parseInt(element.style.left); 
		var relTop = e.clientY - parseInt(element.style.top); 
		
		element.onmouseup = function(){
			isDrag = false; 
		} 
		document.onmousemove = function(e_move){ 
			var e_move = e_move || window.event; 
			if(isDrag){ 
				element.style.left=e_move.clientX - relLeft + "px"; 
				element.style.top=e_move.clientY - relTop + "px"; 
				return false; 
			} 
		} 
	} 
	window.onload = function(){ 
	 
		var element = document.getElementById("elimg"); 
		var element2 = document.getElementById("eldiv"); 
		addListener(element,"mousedown",drag); 
		addListener(element2,"mousedown",drag); 
	} 
</script> 
<div id="eldiv" style="width:140px;height:100px;background:#EEE;position:absolute;left:117px;top:124px">
	hello,大家好
</div> 
<img id="elimg" style="left:609px;top:113px;position:absolute" src="1.jpg" />