var $=function(id){return document.getElementById(id);};
 
var getMouseP=function (e){//获取鼠标坐标 请传递evnet参数
 
				e = e || window.event;
				var m=(e.pageX || e.pageY)?{ x:e.pageX, y:e.pageY } : { x:e.clientX + document.body.scrollLeft - document.body.clientLeft, y:e.clientY + document.body.scrollTop  - document.body.clientTop };
				   return m;
 
			};
 
move=function(o,t){
				o=$(o);
				t=$(t);
				o.onmousedown=function(ev){
					var mxy=getMouseP(ev);//获取当前鼠标坐标
					var by={x:mxy.x-(t.offsetLeft),y:mxy.y-(t.offsetTop)};
					o.style.cursor="move";
					document.onmousemove=function(ev){
							var mxy=getMouseP(ev);
							t.style.left=mxy.x-by.x+"px";
							t.style.top=mxy.y-by.y+"px";
						};
					document.onmouseup=function(){
							window.getSelection ? window.getSelection().removeAllRanges() : document.selection.empty();
							this.onmousemove=null;
						}
				}
	}
move("jelle_test_div","jelle_test_div");