$(".menu_list_c").mouseover(function() {
	var id_menu = $(this).children().children().attr('id');
	$('#'+id_menu).attr('src', '/themes/default/images/'+id_menu+'o.jpg');
	}).mouseout(function(){
	var id_menu = $(this).children().children().attr('id');
	$('#'+id_menu).attr('src', '/themes/default/images/'+id_menu+'.jpg');
});