$(document).ready(function(){
if(document.location.href) 
		hrefString = document.location.href;
else
       hrefString = document.location;

str = hrefString.split('/');
len=str.length;
$('#nav').find('a').each(function(i){
 if($(this).attr('href')==str[len-1]){
     val=$(this).find('img').attr('name');
	 img_name = "images/"+val+"_h.gif"
   	 $(this).find('img').attr({'src':img_name});
 }
});
});