var mySlide0;
	var mySlide1;
	var mySlide2;
	var mySlide3;
	var mySlide4;
	var mySlide5;
	var sw = false;
	var img = $('adv_img');
	var eimg_src = 'images/enlarge.gif';
	var simg_src = 'images/shrink.gif';
	
	var max = 5;
	var pool;
	
	function addOption()
	{
		for(var i=0; i<pool.length; i++)
		{
			if(pool[i] == 0)
			{
				showOption(i);
				break;
			}
		}
	}
	
	function advOption()
	{
		if(sw)
		{
			sw = false;
			$('adv_img').src = eimg_src;
		}
		else
		{
			sw = true;
			$('adv_img').src = simg_src;
		}
	}
	
	function showOption(idx)
	{
		switch(idx)
		{
			case 0:
				mySlide1.toggle();
				pool[0] = 1;
				break;
			case 1:
				mySlide2.toggle();
				pool[1] = 1;
				break;
			case 2:
				mySlide3.toggle();
				pool[2] = 1;
				break;
			case 3:
				mySlide4.toggle();
				pool[3] = 1;
				break;
			case 4:
				mySlide5.toggle();
				pool[4] = 1;
				$('toggle0').disabled = true;
				break;
		}
	}
	
	function checkAndRemoveItem(idx)
	{
		var word;
		switch(idx)
		{
			case 1:
				pool[0] = 0;
				mySlide1.hide();
				word = document.getElementById("keywordqueryWord1");
				word.value = "";
				break;
			case 2:
				pool[1] = 0;
				mySlide2.hide();
				word = document.getElementById("keywordqueryWord2");
				word.value = "";
				break;
			case 3:
				pool[2] = 0;
				mySlide3.hide();
				word = document.getElementById("keywordqueryWord3");
				word.value = "";
				break;
			case 4:
				pool[3] = 0;
				mySlide4.hide();
				word = document.getElementById("keywordqueryWord4");
				word.value = "";
				break;
			case 5:
				pool[4] = 0;
				mySlide5.hide();
				word = document.getElementById("keywordqueryWord5");
				word.value = "";
				break;
		}
	}
	
	window.addEvent('domready', function() {
		pool = new Array(max);
		for(var i=2; i<pool.length; i++)
		{
			pool[i] = 0;
		}
		pool[0] = 1;
		pool[1] = 1;	
		
		mySlide0 = new Fx.Slide('option0');
		
		mySlide1 = new Fx.Slide('keywordoption1');
		mySlide2 = new Fx.Slide('keywordoption2');
		
		mySlide3 = new Fx.Slide('keywordoption3').hide();
		mySlide4 = new Fx.Slide('keywordoption4').hide();
		mySlide5 = new Fx.Slide('keywordoption5').hide();
		
		
		$('toggle0').addEvent('click', function(e){
			e = new Event(e);
			addOption();
			e.stop();
		});

		$('keywordtoggle1').addEvent('click', function(e){
					e = new Event(e);
					checkAndRemoveItem(1);
					$('toggle0').disabled = false;
					e.stop();
		});
		
		$('keywordtoggle2').addEvent('click', function(e){
					e = new Event(e);
					checkAndRemoveItem(2);
					$('toggle0').disabled = false;
					e.stop();
		});
		
		$('keywordtoggle3').addEvent('click', function(e){
					e = new Event(e);
					checkAndRemoveItem(3);
					$('toggle0').disabled = false;
					e.stop();
		});	
		
		$('keywordtoggle4').addEvent('click', function(e){
					e = new Event(e);
					checkAndRemoveItem(4);
					$('toggle0').disabled = false;
					e.stop();
		});	
		
		$('keywordtoggle5').addEvent('click', function(e){
					e = new Event(e);
					checkAndRemoveItem(5);
					$('toggle0').disabled = false;
					e.stop();
		});

	});