function imageSwap(imgName,imgObj) { 
	if (document.images && preloaded) document.images[imgName].src = imgObj.src		
}

function msover(imgName) {
	imageSwap(imgName,aImages[imgName + '_over'])
}

function msout(imgName) { 
	imageSwap(imgName,aImages[imgName + ''])
}

var aImages = new Array()

function preload(imgObj,imgSrc) {
	if (document.images) { 
		aImages[imgObj] = new Image()
		aImages[imgObj].src = imgSrc
	}
}

var preloaded;
preloaded = false;

function preloadImages() {
    preload("arrow_left","/Images/arrowLeft.jpg");
    preload("arrow_left_over","/Images/arrowLeftOver.jpg");
    preload("arrow_right","/Images/arrowRight.jpg");
    preload("arrow_right_over","/Images/arrowRightOver.jpg");                          
                                                    
    preloaded = true;
}