var currentPicture = 0;
			//var pictureArray = new Array('slike/Bill_Gates.jpg', 'slike/Linus_Torvalds.jpeg', 'slike/tux.png', 'slike/linux-desktop-i-want-to-believe.jpg');
			
			function changePicture(index)
			{
				//Shouldn't happen, scince controls are disabled but just in case
				//alert('Menjam na:' + index);
				
				var imageName = 'image' + index;
				
				if (index > pictureArray.length || index < 0) return;
						
				currentPicture = index;				
				document['mainImage'].src=pictureArray[index];	
				document.getElementById(imageName).src = '../images/viewed.jpg';
				setStatus(index);
				setControls();
			}	   
			
			function moveBack()
			{	
				changePicture(currentPicture - 1);			
			}
			
			function moveForward()
			{				
				changePicture(currentPicture + 1);
			}			
			
			function setControls()
			{
				
				if (pictureArray.length < 2)
				{
					//alert('Izklapljam gumbe');
					//No use for a buttons
					btnPrev.disabled = true;
					btnNext.disabled = true;
					return;
				}
				
				if (currentPicture == pictureArray.length - 1) 
					btnNext.disabled = true;
				else
					btnNext.disabled = false;
					
				if ((currentPicture - 1) < 0) 
					btnPrev.disabled = true;
				else
					btnPrev.disabled = false;		
			}
			
			function setStatus(index)
			{
				var controlName = "image" + index;
				var element = document.getElementById(controlName);
				
				if (element.value.indexOf("[Pogledano]") == -1)	
				{			
					element.value = element.value + " " + "[Pogledano]";
				
				}	
				//if (element.src.indexOf("viewed") == -1)
				document.getElementById('image0').src = '../images/viewed.jpg';
			}