function imgScroll(wapper,width,num) {
    var totalLeft = width * $(wapper).find('li').length;
    var left = parseInt($(wapper).css('left'))-(width*num);
    if (left > 0) left = 0;
    if (left + totalLeft <= 0) return false;
    $(wapper).animate({
        left: left+'px'
        }, "slow");
}

function switchTab(tabUl,contentUl) {
    $(tabUl).find('li').mouseover(function(){
        $(tabUl+'>li').removeClass('on');
        $(this).addClass('on');
        $(contentUl+'>li').hide();
        $('#'+$(this).attr('rel')).show();
    });
}
$(function(){
    switchTab('#top-news-tab-title','#top-news-tab-content');
    switchTab('#zhuanye-tab-title','#zhuanye-tab-content');
})