function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}
<!-- 
function MM_reloadPage(init) { //reloads the window if Nav4 resized 
if (init==true) with (navigator) {if ((appName=="Netscape")&&(parseInt(appVersion)==4)) { 
document.MM_pgW=innerWidth; document.MM_pgH=innerHeight; onresize=MM_reloadPage; }} 
else if (innerWidth!=document.MM_pgW || innerHeight!=document.MM_pgH) location.reload(); 
} 
MM_reloadPage(true); 
// --> 

function MM_findObj(n, d) { //v4.0 
var p,i,x; if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) { 
d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);} 
if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n]; 
for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document); 
if(!x && document.getElementById) x=document.getElementById(n); return x; 
}

function MM_showHideLayers() { //v6.0
  var i,p,v,obj,args=MM_showHideLayers.arguments;
  for (i=0; i<(args.length-2); i+=3) if ((obj=MM_findObj(args[i]))!=null) { v=args[i+2];
    if (obj.style) { obj=obj.style; v=(v=='show')?'visible':(v=='hide')?'hidden':v; }
    obj.visibility=v; }
}


function show_leftmenu(id){
	var left_Obj = document.getElementsByName("left_menu");
	var left_Obj_len = left_Obj.length;
	for (i=0;i<left_Obj_len;i++){
		if(i==id){
			left_Obj[i].style.display="";
		}else{
			left_Obj[i].style.display="none";
		}
	}

}


function showlayer(ev,content){                                    //参数直接写i, 写var i不能生效
	 //alert(content);
	 var obj= eval(document.getElementById("layer"));　　            //通过id获取对象
	 ev = ev || window.event;
	 if(ev.clientX=="undefined"){
		X = ev.pageX;
		Y = ev.pageY;
	 }else{
		X = ev.clientX;
		Y = ev.clientY;
	 }
	 obj.style.display ="block";                                          //不写双引号会无法生效
	 document.getElementById("layer").innerHTML = content ;
	 obj.style.left=X+document.documentElement.scrollLeft+"px";  　//取当前鼠标的位置
	 obj.style.top=Y+document.documentElement.scrollTop+"px";
}
function hidelayer(){
	 var obj=document.getElementById("Layer");
	 obj.style.display ="none";                                      //不写双引号会无法生效
}