js 仿alert 不带关闭

oMove = function(obj,event) {   
		
        var otop,oleft;   
		var evt = event? event: window.event; 
        otop = evt.clientY - obj.offsetTop;   
        oleft = evt.clientX - obj.offsetLeft; 
		var isIE=document.all? true:false;
		
		if (isIE){
			obj.setCapture();
		}else{
			window.captureEvents(evt.MOUSEMOVE|evt.MOUSEUP);
		}
        
		
        obj.onmousemove  = function(evt)   
        {   
			if (isIE){
				obj.style.left = event.x  - oleft; 
            	obj.style.top = event.y - otop;  
			}else{
				obj.style.left = evt.pageX  - oleft; 
            	obj.style.top = evt.pageY - otop;  
			}
             
        }   
        obj.onmouseup  = function()   
        {   
            obj.onmousemove = null;   
            obj.style.filter = null; 
			if (isIE){
            	obj.releaseCapture(); 
			}else{
				obj.releaseEvents(evt.MOUSEMOVE|evt.MOUSEUP);
			}    
        }   
    }