(function($){
	
	var options = {
		diff: 10
	};
	
	$.fn.threeImg = function(diff) {
		return this.each(function() {
			
			if(!diff){
				diff = options.diff;
			}
			
			var w = $(this).width();
			var b = $(this).attr('src');
					
			b = b.split('.');
			
			var type = b[1];
			b = b[0];
			
			var url = b+"_"+w+"_"+diff+"."+type;
					
			
			$(this).attr('src',url);
			
		});
	};
})( jQuery );