关于JQuery兼容IE6.0

像类似下面的代码, 在IE6.0中总是javascript出错
    $(function() {                
        $('#exec')
        .hover(
            function(){
                $(this).addClass("ui-state-active");
            },
            function(){
                $(this).removeClass("ui-state-active");
            }
        ).mousedown(function(){
            $(this).addClass("ui-state-active");
        })
        .mouseup(function(){
                $(this).removeClass("ui-state-active");
        });
         $('#logout')
        .hover(
            function(){
                $(this).addClass("ui-state-active");
            },
            function(){
                $(this).removeClass("ui-state-active");
            }
        ).mousedown(function(){
            $(this).addClass("ui-state-active");
        })
        .mouseup(function(){
                $(this).removeClass("ui-state-active");
        });
    });

看看你是不是用了什么和jQ冲突的JS程序