function changeimg(name)
	{
		if (name.slice(0,7) == "menu_01"){document.all.menu_01.src = "" + name + ".htm";} 
		else if (name.slice(0,7) == "menu_02"){	document.all.menu_02.src = "" + name + ".htm";} 
		else {alert("filename error!");}
	}
function changebackg(name)
	{
		document.all.backg.src = "./" + name + ".htm";
	}
function changemenu_02(name)
	{
		document.all.menu_02.src = "./" + name + ".htm";
	}
		
function drag(obj)  
    {  
        var s = obj.style  
        var b = document.body  
        var x = event.clientX + b.scrollLeft - s.pixelLeft  
        var y = event.clientY + b.scrollTop - s.pixelTop  
        var m = function()  
        {  if (event.button == 1)  
            {  
                s.pixelLeft = event.clientX + b.scrollLeft - x  
                s.pixelTop = event.clientY + b.scrollTop - y  
            }  
            else document.detachEvent("onmousemove", m)  
        }  
        document.attachEvent("onmousemove", m)  

        if (!this.z) this.z = 10001
        s.zIndex = ++this.z  
        
        createMask();
        $(document).ready(function() {
        $("#divmw").removeClass("mw1");    //删除层z-index CSS定义
		$("#divmw").addClass("mw2");
        $("#divsw").removeClass("sw1");    //删除层z-index CSS定义
		$("#divsw").addClass("sw2");
        $("#divbw").removeClass("bw1");    //删除层z-index CSS定义
		$("#divbw").addClass("bw2");
		
});
        
        event.cancelBubble = true  
    }  
    
        function createMask(){
            //创建背景
            var rootEl=document.documentElement||document.body;
            var docHeight=((rootEl.clientHeight>rootEl.scrollHeight)?rootEl.clientHeight:rootEl.scrollHeight)+"px";
            var docWidth=((rootEl.clientWidth>rootEl.scrollWidth)?rootEl.clientWidth:rootEl.scrollWidth)+"px";
            var shieldStyle="position:absolute;top:0px;left:0px;width:"+docWidth+";height:"+docHeight+";background:#000;z-index:10000;filter:alpha(opacity=20);opacity:0";
            $("<div id='shield' style=\""+shieldStyle+"\"></div>").appendTo("body");
        }
        

        
        function del(shield){
                $("#shield").remove();    //删除蒙板                
                $("#divmw").removeClass("mw2");    //删除层z-index CSS定义
				$("#divmw").addClass("mw1");
                $("#divsw").removeClass("sw2");    //删除层z-index CSS定义
				$("#divsw").addClass("sw1");
                $("#divbw").removeClass("bw2");    //删除层z-index CSS定义
				$("#divbw").addClass("bw1");
            }