//ÐÂÎÅÂÖ·¬¹ö¶¯
$(function(){
        var $this = $(".new_course");
		var scrollTimer;
		$this.hover(function(){
			  clearInterval(scrollTimer);
		 },function(){
		   scrollTimer = setInterval(function(){
						 scrollNews( $this );
					}, 2000 );
		}).trigger("mouseleave");
});
function scrollNews(obj){
   var $self = obj.find("ul:first"); 
   var $firstli = $self.find("li:first");
   var firstlivalue="<li>"+$firstli.html()+"</li>";
   var lineHeight=$firstli.height(); 
   $self.animate({ "marginTop" : -lineHeight +"px" }, 600 , function(){
         $self.css({marginTop:0}).append(firstlivalue); 
        $(obj.find("ul li:first-child")).remove();
   });
}