jQuery.fn.highlight = function(selector, className, eventStart, eventEnd){

		// variables
			var className		= className || 'highlight';
			if(eventStart == undefined && eventEnd == undefined){
				var eventStart = 'mouseover';
				var eventEnd = 'mouseout';
				}
			else if(eventStart == eventEnd || eventStart != undefined && eventEnd == undefined){
				var toggle = true;
				}

		// code
			this.each
				(
				function(){

					var tagName	= this.tagName.toLowerCase();

					if(tagName == 'form'){

						selector		= selector || 'li';
						var elements 	= jQuery("textarea, select, multi-select, :text, :image, :password, :radio, :checkbox, :file", this);

						elements.bind
							(
							'focus',
							function(){
								var parents	= jQuery(this).parents(selector)
								var parent	= jQuery(parents.get(0))
								parent.addClass(className);
								}
							);

						elements.bind
							(
							'blur',
							function(){
								var parents	= jQuery(this).parents(selector)
								var parent	= jQuery(parents.get(0))
								parent.removeClass(className);
								}
							);

						}

					else{


						if(tagName.match(/^(table|tbody)$/) != null){
							selector = selector || 'tr';
							}
						else if(tagName.match(/^(ul|ol)$/) != null){
							selector = selector || 'li';
							}
						else{
							selector = '*';
							}

						var elements	= jQuery(selector, this);

						if(toggle){
							elements.bind
								(
								eventStart,
								function(){
									if(jQuery(this).hasClass(className)){
										jQuery(this).removeClass(className);
										}
									else{
										jQuery(this).addClass(className);
										}
									}
								);

							}

						else{
							elements.bind
								(
								eventStart,
								function(){
									jQuery(this).addClass(className);
									}
								);

							elements.bind
								(
								eventEnd,
								function(){
									jQuery(this).removeClass(className);
									}
								);
							}

						}
					}
				);

		}