(function($){
	$.fn.extend({
		imghover: function(opt){
			return this.each(function() {
		opt = $.extend({
			prefix: '',
			suffix: '_o',
			src: '',
			btnOnly: true,
			fade: false,
			fadeSpeed: 500
		  }, opt || {});

		var node = $(this);
				if(!node.is('img')&&!node.is(':image')){
		  var sel = 'img,:image';
		  if (opt.btnOnly) sel = 'a '+sel;
		  node.find(sel).imghover(opt);
		  return;
		}

		var orgImg = node.attr('src');

		var hoverImg;
		if(opt.src){
		  hoverImg = opt.src;
		}else{
		  hoverImg = orgImg;
		  if(opt.prefix){
			var pos = hoverImg.lastIndexOf('/');
			if(pos>0){
			  hoverImg = hoverImg.substr(0,pos-1)+opt.prefix+hoverImg.substr(pos-1);
			}else{
			  hoverImg = opt.prefix+hoverImg;
			}
		  }
		  if(opt.suffix){
			var pos = hoverImg.lastIndexOf('.');
			if(pos>0){
			  hoverImg = hoverImg.substr(0,pos)+opt.suffix+hoverImg.substr(pos);
			}else{
			  hoverImg = hoverImg+opt.suffix;
			}
		  }
		}

		if(opt.fade){
		  var offset = node.offset();
		  var hover = node.clone(true);
		  hover.attr('src', hoverImg);
		  hover.css({
			position: 'absolute',
			left: offset.left,
			top: offset.top,
			zIndex: 1000
		  }).hide().insertAfter(node);
		  node.mouseover(
			function(){
			  var offset=node.offset();
			  hover.css({left: offset.left, top: offset.top});
			  hover.fadeIn(opt.fadeSpeed);
			  node.fadeOut(opt.fadeSpeed,function(){node.show()});
			}
		  );
		  hover.mouseout(
			function(){
			  node.fadeIn(opt.fadeSpeed);
			  hover.fadeOut(opt.fadeSpeed);
			}
		  );
		}else{
		  node.hover(
			function(){node.attr('src', hoverImg)},
			function(){node.attr('src', orgImg)}
		  );
		}
			});
		}
	});
})(jQuery);