var screenshots = {
	
	shift: function(galID,direction,totalImgs,imgsPerPage) {
		var sliderID = "slider_" + galID;
		var pixelsPerImg = 104;
		var pixelsToShift = pixelsPerImg * imgsPerPage;
		var maxShift = (totalImgs * pixelsPerImg) * -1;
		
		if(direction == "right"){
			var finalShift = parseInt($(sliderID).style.left) - parseInt(pixelsToShift);
			if(finalShift > maxShift){
				$(sliderID).morph('left: ' + finalShift  + "px", {duration: 1});
			}
		}
		if(direction == "left"){
			var finalShift = parseInt($(sliderID).style.left) + parseInt(pixelsToShift);
			if(finalShift <= 0){
				$(sliderID).morph('left: ' + finalShift + "px", {duration: 1});
			}
		}		
	}
	
}


document.observe('dom:loaded', screenshots.init);