javascript添加事件。兼容火狐IE

function AttachEvent(target, eventName, handler, argsObject)
{
    var eventHandler = handler;
    if(argsObject)
    {
        eventHander = function(e)
        {
            handler.call(argsObject, e);
        }
    }
    if(window.attachEvent)//IE
        target.attachEvent("on" + eventName, eventHander );
    else//FF
        target.addEventListener(eventName, eventHander, false);
}
function mouseeventover()
{

				if(this.obj.className == "main_menu jt_u")
				{
					this.obj.className = "main_menu s_menu_bg";
					this.oldobj.className = "jt_s";
				}
				if(this.obj.className == "main_menu jt_u_inblock")
				{
					this.obj.className = "main_menu s_menu_bg";
					this.oldobj.className = "jt_s_inblock";
				}			
}
var args = new Object();
				args.obj = obj;
				args.oldobj = oldobj;
				AttachEvent(obj,"mouseover",mouseeventover,args);