jquery与Discuz代码冲突的解决方法

<script typet="text/javascript" src="http://www.aizhanku.com/jquery/1.9.1/jquery.min.js"></script><script type='text/javascript' >    $(window).bind("scroll",        function() {        var st = $(document).scrollTop();        var sel=$("#J_m_nav,top");        if (st > 600) {            sel.addClass("nav_fixed");        } else {            sel.removeClass("nav_fixed");        }    });</script>

<script typet="text/javascript" src="template/xiaoguotuzhijia/js/picLoad/jquery-1.9.1.min.js"></script><script type='text/javascript' >var jq = jQuery.noConflict();    jq(window).bind("scroll",        function() {        var st = jq(document).scrollTop();        var sel=jq(".hdc");        if (st > 580) {            sel.addClass("nav_fixed");        } else {            sel.removeClass("nav_fixed");        }    });</script>