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_showHideLayers() { //v9.0
  var i,p,v,obj,args=MM_showHideLayers.arguments;
  for (i=0; i<(args.length-2); i+=3) 
  with (document) if (getElementById && ((obj=getElementById(args[i]))!=null)) { v=args[i+2];
    if (obj.style) { obj=obj.style; v=(v=='show')?'visible':(v=='hide')?'hidden':v; }
    obj.visibility=v; }
}
/**  

 * 回到页面顶部  

 * @param acceleration 加速度  

 * @param time 时间间隔 (毫秒)  

 **/ 

function goTop(acceleration, time) {  

    acceleration = acceleration || 0.1;  

    time = time || 16;  

   

    var x1 = 0;  

    var y1 = 0;  

    var x2 = 0;  

    var y2 = 0;  

    var x3 = 0;  

    var y3 = 0;  

   

    if (document.documentElement) {  

        x1 = document.documentElement.scrollLeft || 0;  

        y1 = document.documentElement.scrollTop || 0;  

    }  

    if (document.body) {  

        x2 = document.body.scrollLeft || 0;  

        y2 = document.body.scrollTop || 0;  

    }  

    var x3 = window.scrollX || 0;  

    var y3 = window.scrollY || 0;  

   

    // 滚动条到页面顶部的水平距离  

    var x = Math.max(x1, Math.max(x2, x3));  

    // 滚动条到页面顶部的垂直距离  

    var y = Math.max(y1, Math.max(y2, y3));  

   

    // 滚动距离 = 目前距离 / 速度, 因为距离原来越小, 速度是大于 1 的数, 所以滚动距离会越来越小  

    var speed = 1 + acceleration;  

    window.scrollTo(Math.floor(x / speed), Math.floor(y / speed));  

   

    // 如果距离不为零, 继续调用迭代本函数  

    if(x > 0 || y > 0) {  

        var invokeFunction = "goTop(" + acceleration + ", " + time + ")";  

        window.setTimeout(invokeFunction, time);  

    }  

}