$(function(){
    $('ul li span').mouseover(function(){
        var bglink = $(this).attr("href");
        $("#header")
         .css("background-image","url("+bglink+")");
    });
});

$(function(){
    $('h4').mouseover(function(){
        var bglink = $(this).attr("href");
        $("#cont03r")
         .css("background-image","url("+bglink+")");
    });
});