function imageSwap(image,direction,index){
	    if (direction == 'on'){ image.src = swapOn[index].src; }
	    else { image.src = swapOff[index].src; }
    }
    
    function navOn(rowId,imgId){
		document.getElementById(rowId).className = "cBackB30";
		document.getElementById(imgId).src = onArrow.src;
    }
    
    function navOff(rowId,imgId){
		document.getElementById(rowId).className = "";
		document.getElementById(imgId).src = offArrow.src;
    }
    
    // preload navigation-arrow images
    if (document.images) {
		var onArrow = new Image();
		onArrow.src = "/objects/images/navigation_arrow_on.gif"
		
		var offArrow = new Image();
		offArrow.src = "/objects/images/navigation_arrow_off.gif"
	}