javascript最短的拖动代码[兼容FF]

来自：第九网络
http://www.the9web.com 

以下为程序代码:

<! 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" >   
< head >< meta  http-equiv ="Content-Type"  content ="text/html; charset=gb2312"   />   
< script  language ="JavaScript"  type ="text/javascript" > ...   
var x,y  
var drag_=false  
var D=new Function('obj','return document.getElementById(obj);')  
var IE=new Function('','if(navigator.appName.indexOf("Explorer")>=0)return 1;if(navigator.appName.indexOf("Netscape")>=0)return 2')  
function Move_obj(obj)...{//1  
                     D(obj).onmousedown=function(e)...{drag_=true//4  
                              with(this)...{style.position="absolute";temp1=offsetLeft;temp2=offsetTop;//5  
                              if(IE()==1)...{x=event.clientX;y=event.clientY//6  
                                  document.onmousemove=function(e)...{//7  
                                        if(drag_==false)return false  
                                     with(this)...{style.left=temp1+event.clientX-x+"px";style.top=temp2+event.clientY-y+"px"}  
                                     }//7  
                              }//6  
                              if(IE()==2)...{x=e.pageX;y=e.pageY;//8  
                                  document.onmousemove=function(e)...{//9  
                                        if(drag_==false)return false  
                                     with(this)...{style.left=temp1+e.pageX-x+"px";style.top=temp2+e.pageY-y+"px"}  
                                     }//9  
                              }//8  
                        }//5  
           document.onmouseup=new Function("drag_=false")  
                     }//4  
}//1  
</ script >
</ head >
< body >   
< div  id ="test"  style ="background-color:#0099CC;width:200px" onmouseover ='Move_obj("test")' > 这个是可以拖动的层  < a  href ="http://www.the9web.com" > 第九网络 </ a ></ div >  
</ body >
</ html >