非常不错的一个javascript 类
代码如下：

/*  
 *  Author:aoao
 *    Homepage:http://www.loaoao.com
 *  Email:loaoao@gmail.com / QQ:2222342
 *  Copyright (c) 2006 aoao
 *  Licensed under a Creative Commons Attribution 2.5 License (http://creativecommons.org/licenses/by/2.5/) 
 */

var jscc = new Object();
var loaoao = new Object();//^_^//
jscc = {    
    init:function(){/*_*/},
    path:"/scripts/jscc/",
    include:function (file){
        var j=document.createElement("script");
        j.setAttribute('type','text/javascript');
        j.setAttribute('src',jscc.path+file+'.js');
        document.getElementsByTagName("head")[0].appendChild(j);
    }
};

jscc.addEvent = function( obj, type, fn ) {
    if ( obj.attachEvent ) {        
      obj['e'+type+fn] = fn;
      obj[type+fn] = function(){obj['e'+type+fn]( window.event );}
      obj.attachEvent( 'on'+type, obj[type+fn] );
    } else {
      obj.addEventListener( type, fn, false );
    }
};
// Cookies
jscc.cookie = {
    create:function (name,value,days) {
      if (days) {
        var date = new Date();
        date.setTime(date.getTime()+(days*24*60*60*1000));
        var expires = "; expires="+date.toGMTString();
      }
      else expires = "";
      document.cookie = name+"="+value+expires+"; path=/";
    },
    read:function(name) {
      var nameEQ = name + "=";
      var ca = document.cookie.split(';');
      for(var i=0;i  ca.length;i++) {
        var c = ca[i];
        while (c.charAt(0)==' ') c = c.substring(1,c.length);
        if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
      }
      return null;
    }
};


jscc.getPageSize=function(){
    // reference lightbox (http://www.huddletogether.com/projects/lightbox/lightbox.js)
     var theWidth,theHeight;
    if (window.innerHeight&&window.scrollMaxY) {
        theWidth = window.innerWidth;
        theHeight = window.innerHeight+ window.scrollMaxY;
     } 
    else if (document.body){
        theWidth=((document.body.scrollWidth  document.body.offsetWidth)?document.body.scrollWidth : document.body.offsetWidth );
        theHeight=((document.body.scrollHeight  document.body.offsetHeight)?document.body.scrollHeight  : document.body.offsetHeight );
    }
    var winWidth ,winHeight; 
    if (self.innerHeight) {    
        winWidth = self.innerWidth;
        winHeight = self.innerHeight;
    } else if (document.documentElement && document.documentElement.clientHeight) {
        winWidth = document.documentElement.clientWidth;
        winHeight = document.documentElement.clientHeight;
    } else if (document.body) {
        winWidth = document.body.clientWidth;
        winHeight = document.body.clientHeight;
    }
    var pWidth=(theWidthwinWidth?theWidth:winWidth)
    var pHeight=(theHeightwinHeight?theHeight:winHeight)

    var yScroll;
    if (self.pageYOffset) {
        yScroll = self.pageYOffset;
    } else if (document.documentElement && document.documentElement.scrollTop){     // Explorer 6 Strict
        yScroll = document.documentElement.scrollTop;
    } else if (document.body) {// all other Explorers
        yScroll = document.body.scrollTop;
    }
    var getPageSize = new Array(pWidth,pHeight,winWidth,winHeight,yScroll) 
    return getPageSize;
}


jscc.widgets = {/**/};
jscc.widgets.fixedsidebar = {
    fixedHeight:0,
    oldScrolltop:0,
    init: function(){
        if (!document.getElementById("sidebar")) return;
        jscc.addEvent(window,"scroll",function(e){jscc.widgets.fixedsidebar.setFixed()});
        jscc.addEvent(window,"resize",function(e){jscc.widgets.fixedsidebar.setFixed()});
        this.fixedHeight=document.getElementById("sidebar").offsetTop;
        this.setFixed();
    },
    setFixed:function(){
        var sidebar=document.getElementById("sidebar");
        var ref=document.getElementById("main");
        var s_t=sidebar.offsetTop;
        var s_h=sidebar.offsetHeight;
        var s_th=s_t+s_h;
        var r_th=ref.offsetTop+ref.offsetHeight;
        var d_st;
        if(document.documentElement.scrollTop){
            d_st=document.documentElement.scrollTop;
        }
        else{
            d_st=document.body.scrollTop
            }
        if(r_th(s_t+s_h)){
            var seHeight=0; 
            if (self.innerHeight) {    seHeight = self.innerHeight;} else if (document.documentElement && document.documentElement.clientHeight) {    seHeight = document.documentElement.clientHeight;} else if (document.body) {seHeight = document.body.clientHeight;}
            try{
                if(seHeights_h){
                    var newtop=(d_stthis.fixedHeight?0:d_st-this.fixedHeight-42);
                }
                else{
                // Thank you dron (http://www.ucren.com/)
                switch (d_st-this.oldScrolltop0)
                    {
                    case true:
                        if (d_st-this.fixedHeight  s_t -seHeight){
                        var    newtop= d_st -this.fixedHeight - (s_h-seHeight)-68;
                        }
                    break;
                    case false:
                        if (d_st-this.fixedHeightparseInt(sidebar.style.marginTop,10)){
                        var newtop= d_st-this.fixedHeight;
                        }
                    break;
                    }
                }
                this.oldScrolltop = d_st;
                if(newtop==undefined){ return;};
                newtop=(newtop0?0:newtop);
                sidebar.style.marginTop= newtop+"px";
            }
            catch(e){
              //alert(e.description);
            }
        }
        else{
            sidebar.style.marginTop="0px";
        }
    }    
};
//jscc.addEvent(window,"load",function(e){jscc.widgets.fixedsidebar.init()});

jscc.widgets.wraphandler = {
    //jscc.widgets.wraphandler reference http://www.collylogic.com/includes/resizer.js (http://www.collylogic.com/?/comments/redesign-notes-1-width-based-layout/)
    init: function() {    
        //if (!document.getElementById) return;
            if( document.getElementById('wrapper').className=="col3"){    
            jscc.wraphandler.setWrapper();
            jscc.addEvent(window,"resize",jscc.wraphandler.setWrapper);
            }
            else{return}
      },
      setWrapper: function() {
       var getPS=jscc.getPageSize();
       var _width=getPS[2];
          if (_width  940) {
            document.getElementById('wrapper').className = 'col2';
          } else {
            document.getElementById('wrapper').className = 'col3';
          }
          if(document.all) {
            if (_width  780) {
            document.getElementById('wrapper').style.width="750px"
              } else {
                document.getElementById('wrapper').style.width="auto"
              }              
          }
      }
};
//jscc.addEvent(window,"load",function(e){jscc.widgets.wraphandler.init()});


jscc.widgets.styleSwitcher = {
    // jscc.widgets.styleSwitcher  reference StyleSwitcher functions( written by Paul Sowden http://www.idontsmoke.co.uk/ss/ . For the details, visit ALA: http://www.alistapart.com/stories/alternate/)
    init:function(e) {
        var cookie = jscc.cookie.read("style");
        var title = cookie ? cookie : this.getPreferred();
        title = (title==null?"left":title);
        this.setActive(title);
        var operactioner = document.getElementById("themes").getElementsByTagName("A");
    operactioner[0].onclick=function() {
        jscc.widgets.styleSwitcher.setActive("left");
        return false;
    };
    operactioner[1].onclick=function() {
        jscc.widgets.styleSwitcher.setActive("right");
        return false;
    };
    this.switcher(title);
    },
    setActive:function(title){
        var i, a, main;
          for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
        if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title")) {
                a.disabled = true;
                if(a.getAttribute("title") == title) a.disabled = false;
            }
        }
        this.switcher(title);
        //jscc.cookie.create("style", title,"365");    
    },
    getActive:function(){
    var i, a;
    for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title") && !a.disabled) return a.getAttribute("title");}
      return null;
    },
    getPreferred:function (){
      var i, a;
      for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
        if(a.getAttribute("rel").indexOf("style") != -1
           && a.getAttribute("rel").indexOf("alt") == -1
           && a.getAttribute("title")
           ) return a.getAttribute("title");
      }
      return null;
    },
    switcher:function(theme){
        if(!document.getElementById(["theme_"+theme])) { return;}
        var notheme=(theme=="left"?"right":"left");
        document.getElementById(["theme_"+notheme]).style.display="inline";
        document.getElementById(["theme_"+theme]).style.display="none";
    },
    end:function(e){
      var title = this.getActive();
      jscc.cookie.create("style", title,"365");
    }
};
//jscc.addEvent(window,"load",function(e){jscc.widgets.styleSwitcher.init()});
jscc.addEvent(window,"unload",function(e){jscc.widgets.styleSwitcher.end()});

jscc.widgets.toTop = {
    init:function(){
        document.getElementById("toTop").onclick=function(e){
            jscc.widgets.toTop.set();
            return false;
        }        
    },
    waitTimer:null,
    set:function(){
        var d_st=document.documentElement.scrollTop;
        if(window.navigator.userAgent.indexOf("MSIE")=1){
            for (var i=d_st; i10; i-=Math.floor(i/6)){
            window.scrollTo(0,i);
            }
            window.scrollTo(0,10);
        }
        else{
        window.scrollTo(0,Math.floor(d_st / 2));

         if(d_st10){
                 waitTimer=setTimeout("jscc.widgets.toTop.set()",20);
          }
            else{
                  clearTimeout(waitTimer);
            }
        }
    }
}
jscc.api={
    google:{
        init:function(){
        try{
            var searchControl = new GSearchControl();
        }
            catch(e){
             return;
            }

        var options = new GdrawOptions();
        options.setSearchFormRoot(document.getElementById("googleSearchForm"));
        options.setDrawMode(GSearchControl.DRAW_MODE_TABBED);
         searchControl.setLinkTarget(GSearch.LINK_TARGET_SELF);
        searchControl.setResultSetSize(GSearch.LARGE_RESULTSET);

        var siteSearch = new GwebSearch();
        siteSearch.setUserDefinedLabel("站内搜索");
        siteSearch.setUserDefinedClassSuffix("siteSearch");
        siteSearch.setSiteRestriction("www.loaoao.com");
        searchControl.addSearcher(siteSearch);
        var labSearch = new GwebSearch();
        labSearch.setUserDefinedLabel("嗷嗷的实验室搜索");
        labSearch.setUserDefinedClassSuffix("labSearch");
        labSearch.setSiteRestriction("lab.loaoao.com");
        searchControl.addSearcher(labSearch);
        var wwwSearch = new GwebSearch();
        wwwSearch.setUserDefinedLabel("Google搜索");
        labSearch.setUserDefinedClassSuffix("wwwSearch");
        searchControl.addSearcher(wwwSearch);

        searchControl.draw(document.getElementById("googleSearchResults"), options);
        //    searchControl.execute("css");
        }
    }
}
loaoao.com = function(){
    if (!document.getElementById) return;
    jscc.widgets.styleSwitcher.init();
    jscc.widgets.fixedsidebar.init();
    jscc.widgets.toTop.init();    
    jscc.api.google.init();    


};
jscc.addEvent(window,"load",loaoao.com);