非常不错的一个javascript 类

                newtop=(newtop<0?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"