jQuery(document).ready(function(){
				$("#nav li a img").not("img.active").hover(function(){
					var asrc = $(this).attr("src");
					if (asrc.substring(asrc.length-9,asrc.length-4) !== '_down') {
				           var bsrc = asrc.substring(0,asrc.length-4)+"_down"+asrc.substring(asrc.length-4);
      				       $(this).attr("src",bsrc);
					}     					
    			},
				function(){
					var asrc = $(this).attr("src");
					if (asrc.substring(asrc.length-9,asrc.length-4) == '_down')  { 
    				 		var bsrc = asrc.substring(0,asrc.length-9)+asrc.substring(asrc.length-4);
							$(this).attr("src",bsrc);
     				}
				});
		 	});