var active_el = '';

$(document).ready(function(){
   $(".siteHeaderNavItem").not(".siteNavItemActive").hover(
        function(){
            i = $(this).find('img').eq(0);
            newp = $(i).attr('src').replace('_up','_over');
            $(i).attr('src',newp);
        },
        function(){
            i = $(this).find('img').eq(0);
            newp = $(i).attr('src').replace('_over','_up');
            $(i).attr('src',newp);
			
        }
    );
    // set active nav item, if there is one
    if(active_el !== ''){
        i = $("#"+active_el).find("img:eq(0)");
        newp = $(i).attr('src').replace('_up','_selected');
        $(i).attr('src',newp);
    }
});