var t = window.setInterval("changpic2()", 4000);
function changpic2() {
    if ($('#WebNews').css("display") == "block") {
        $('#WebNews').css("display", "none");
        $('#EXinNews').css("display", "block")
    }
    else {
        $('#WebNews').css("display", "block");
        $('#EXinNews').css("display", "none")
    }
}
$(document).ready(function() {
        $('#EXinJiaYuan').bind("mouseover", function() { clearInterval(t); });
        $('#EXinJiaYuan').bind("mouseout", function() {
       // window.setInterval("num=changpic(num)", 4000);
        t=  window.setInterval("changpic2()", 4000);
    });
});