$(function() {  
     var bnstudio_initial;
     $("#studio-nav > li").hover(  
         function() {  
             
             var img = $(this).children().children();
             
             bnstudio_initial = img.attr('src')
             var src = bnstudio_initial.split('.jpg')[0] + '_on.jpg';
             img.attr('src',src);
             $(this).addClass("studiohover")
         },  
         function() {  
            
            var img = $(this).children().children();
            if (img.attr('id') == null || img.attr('id') == ''){
	            img.attr('src',bnstudio_initial);
            }
            $(this).removeClass("studiohover");  
         });  
 });