$(function(){
	$("img.hover").hover(function(){
		var ext_point = $(this).attr('src').lastIndexOf('.');
		var img_src = $(this).attr('src');
		var ext = img_src.substring(ext_point);
		var new_name = img_src.substring(0,ext_point)+"_h"+ext;
		$(this).attr('src',new_name);
	}, function(){
		$(this).attr('src',$(this).attr('src').replace('_h',''));
	});
});