window.addEvent('domready',function() {
	var SelNum = 1;
	$$('#CompareSelected input').each(function(userchoice,i){
		userchoice.addEvent('click',function(e){
			if(userchoice.getProperty('type') == 'checkbox'){
				if(userchoice.getProperty('checked')){
					SelNum++;
				}
				else{
					SelNum--;
				}
				if(SelNum>4){
					userchoice.setProperty('checked',false);
					SelNum--;
					alert('Error: Please select a maximum of 3 products to compare!');	
				}
			}
			else{
				if(SelNum<2){
					e.stop();
					alert('Error: Please select at least 1 additional product to compare!');
				}
			}
		});
	});
});