function setCurrent(thumb, num) {
			Element.removeClassName(document.getElementsByClassName('current_picture' + num)[0], 'current_picture' + num);
			Element.addClassName(thumb, 'current_picture' + num);
			changePic(num);
		}
		
	
		function changePic(num) {
			var thumb = document.getElementsByClassName('current_picture' + num)[0];
		
		
			Element.update('feedBack' + num, 'Loading picture...');
			$('main_picture' + num).src = thumb.src.replace(/-Thumb/,"");
			
			Event.observe('main_picture' + num, 'load', clearMessage(num), false);
			Event.observe('main_picture' + num, 'error', showErrorMessage(num), false);
			
		}
		
		function clearMessage(num) {
			Element.update('feedBack' + num, '');
		}

		
		function showErrorMessage(num) {
			Element.update('feedBack' + num, 'Cannot find image');
		}