js解密高手请进，帮小弟解解！急

var NS4 = (document.layers);
var IE4 = (document.all);var win = this;
var n   = 0;function findInPage(str)
{
var txt, i, found;
if (str == "")
return false;
if (NS4)
{
if (!win.find(str))
while(win.find(str, false, true))
n++;
else
n++;
if (n == 0) alert("[" + str + "]" + unescape("%3F%3F%3F%u60A8%u8981%u627E%u7684%5B%u6B4C%u66F2%5D%u6216%5B%u6B4C%u624B%5D%u4E0D%u5B58%u5728%u3002%u8BF7%u8F93%u5165%u8BE5%5B%u6B4C%u66F2%5D%u4E2D%u7684%u5173%u952E%u5B57%u6216%5B%u6B4C%u624B%5D%u59D3%u540D%u518D%u6B21%u67E5%u627E%uFF01%u8BF7%u5411%u60A8%u7684%u670B%u53CB%u4EEC%u63A8%u8350%20http%3A//mu.265.com%20%5B265%u97F3%u4E50%u7F51%5D%u611F%u8C22%u60A8%u7684%u652F%u6301%uFF01"));
} if (IE4)
{
txt = win.document.body.createTextRange();
for (i = 0; i <= n && (found = txt.findText(str)) != false; i++)
{
txt.moveStart("character", 1);
txt.moveEnd("textedit");
}
if (found)
{
 txt.moveStart("character", -1);
 txt.findText(str);
 txt.select();
 txt.scrollIntoView();
 n++; }
else
{
if (n > 0)
{
n = 0;
findInPage(str);
}
else
alert("[" + str + "]" + unescape("%3F%3F%3F%u60A8%u8981%u627E%u7684%5B%u6B4C%u66F2%5D%u6216%5B%u6B4C%u624B%5D%u4E0D%u5B58%u5728%u3002%u8BF7%u8F93%u5165%u8BE5%5B%u6B4C%u66F2%5D%u4E2D%u7684%u5173%u952E%u5B57%u6216%5B%u6B4C%u624B%5D%u59D3%u540D%u518D%u6B21%u67E5%u627E%uFF01%u8BF7%u5411%u60A8%u7684%u670B%u53CB%u4EEC%u63A8%u8350%20http%3A//mu.265.com%20%5B265%u97F3%u4E50%u7F51%5D%u611F%u8C22%u60A8%u7684%u652F%u6301%uFF01"));
}
}
return false;
}self.onError=null;
currentX = currentY = 0;  
whichIt = null;   
         lastScrollX = 0; lastScrollY = -200;
NS = (document.layers) ? 1 : 0;
IE = (document.all) ? 1: 0;
<!-- STALKER CODE -->
function heartBeat() {
if(IE) { diffY = document.body.scrollTop; diffX = document.body.scrollLeft; }
    if(NS) { diffY = self.pageYOffset; diffX = self.pageXOffset; }
if(diffY != lastScrollY) {                 percent = .1 * (diffY - lastScrollY);
                if(percent > 0) percent = Math.ceil(percent);
                else percent = Math.floor(percent); if(IE) document.all.floater.style.pixelTop += percent;
if(NS) document.floater.top += percent;                  lastScrollY = lastScrollY + percent;
    }
if(diffX != lastScrollX) {
percent = .1 * (diffX - lastScrollX);
if(percent > 0) percent = Math.ceil(percent);
else percent = Math.floor(percent);
if(IE) document.all.floater.style.pixelLeft += percent;
if(NS) document.floater.left += percent;
lastScrollX = lastScrollX + percent;
}
} <!-- /STALKER CODE -->
<!-- DRAG DROP CODE -->
function checkFocus(x,y) { 
        stalkerx = document.floater.pageX;
        stalkery = document.floater.pageY;
        stalkerwidth = document.floater.clip.width;
        stalkerheight = document.floater.clip.height;
        if( (x > stalkerx && x < (stalkerx+stalkerwidth)) && (y > stalkery && y < (stalkery+stalkerheight))) return true;
        else return false;
} function grabIt(e) {
if(IE) {
whichIt = event.srcElement;
while (whichIt.id.indexOf("floater") == -1) {
whichIt = whichIt.parentElement;
if (whichIt == null) { return true; }
    }
whichIt.style.pixelLeft = whichIt.offsetLeft;
    whichIt.style.pixelTop = whichIt.offsetTop;
currentX = (event.clientX + document.body.scrollLeft);
    currentY = (event.clientY + document.body.scrollTop); 
} else { 
        window.captureEvents(Event.MOUSEMOVE);
        if(checkFocus (e.pageX,e.pageY)) { 
                whichIt = document.floater;
                StalkerTouchedX = e.pageX-document.floater.pageX;
                StalkerTouchedY = e.pageY-document.floater.pageY;
        }  }
    return true;
}
function moveIt(e) {
if (whichIt == null) { return false; }
if(IE) {
    newX = (event.clientX + document.body.scrollLeft);
    newY = (event.clientY + document.body.scrollTop);
    distanceX = (newX - currentX);    distanceY = (newY - currentY);     currentX = newX;    currentY = newY;
    whichIt.style.pixelLeft += distanceX;     whichIt.style.pixelTop += distanceY;
if(whichIt.style.pixelTop < document.body.scrollTop) whichIt.style.pixelTop = document.body.scrollTop; if(whichIt.style.pixelLeft < document.body.scrollLeft) whichIt.style.pixelLeft = document.body.scrollLeft;
if(whichIt.style.pixelLeft > document.body.offsetWidth - document.body.scrollLeft - whichIt.style.pixelWidth - 20) whichIt.style.pixelLeft = document.body.offsetWidth - whichIt.style.pixelWidth - 20;
if(whichIt.style.pixelTop > document.body.offsetHeight + document.body.scrollTop - whichIt.style.pixelHeight - 5) whichIt.style.pixelTop = document.body.offsetHeight + document.body.scrollTop - whichIt.style.pixelHeight - 5;
event.returnValue = false;
} else {
whichIt.moveTo(e.pageX-StalkerTouchedX,e.pageY-StalkerTouchedY);
        if(whichIt.left < 0+self.pageXOffset) whichIt.left = 0+self.pageXOffset;
        if(whichIt.top < 0+self.pageYOffset) whichIt.top = 0+self.pageYOffset;
        if( (whichIt.left + whichIt.clip.width) >= (window.innerWidth+self.pageXOffset-17)) whichIt.left = ((window.innerWidth+self.pageXOffset)-whichIt.clip.width)-17;
        if( (whichIt.top + whichIt.clip.height) >= (window.innerHeight+self.pageYOffset-17)) whichIt.top = ((window.innerHeight+self.pageYOffset)-whichIt.clip.height)-17;
        return false;
}
    return false;
}
function dropIt() {
whichIt = null;
    if(NS) window.releaseEvents (Event.MOUSEMOVE);
    return true;
}
<!-- DRAG DROP CODE -->
if(NS) {
window.captureEvents(Event.MOUSEUP|Event.MOUSEDOWN);
window.onmousedown = grabIt;
  window.onmousemove = moveIt;
window.onmouseup = dropIt;
}
if(IE) {
document.onmousedown = grabIt;
  document.onmousemove = moveIt;
document.onmouseup = dropIt;
}
if(NS || IE) action = window.setInterval("heartBeat()",1);document.write(unescape("%3Cdiv%20ID%3D%22floater%22%20align%3D%22center%22%3E%3Ctable%20border%3D%220%22%20width%3D%22100%22%20cellspacing%3D%220%22%20cellpadding%3D%220%22%20%3E%3Ctr%3E%3Ctd%20height%3D%2230%22%20background%3D%22mu_gif/ss_1.gif%22%20width%3D%22100%25%22%20bgcolor%3D%22%23DDF3FF%22%20valign%3D%22middle%22%20%3E%3Cform%20name%3D%22search1%22%20onSubmit%3D%22return%20findInPage%28this.string1.value%29%3B%22%3E%3Cinput%20style%3D%22font-size%3A12px%22%20name%3D%22string1%22%20type%3D%22text%22%20size%3D%2213%22%20value%3D%22%u5199%u5165%u5173%u952E%u5B57%u641C%u7D22%22%20onChange%3D%22n%3D0%3B%22%20onFocus%3D%22window.document.search1.string1.value%3D%27%27%22%20class%3D%22ourfont%22%3E%3Cbr%3E%3Cinput%20alt%3D%22%u67E5%u8BE2%22%20border%3D%220%22%20src%3D%22mu_gif/ss_2.gif%22%20type%3D%22image%22%20name%3D%22%u641C%u7D22%22%3E%3C/form%3E%3C/td%3E%3C/tr%3E%3C/table%3E%3C/div%3E"));