function preloadSubNav(dirNam, imgOnList, imgOffList)
{
	// Pre-load images.
	if (document.images) {
		var imgOn = new Array;
		for (var i=0; i<imgOnList; i++) {
			imgOn[i] = new Image();
			imgOn[i].src="/assets/templates/trios/images/dp/sub_nav/" + dirName + "/" + imgOnList[i];
		}
		
		var imgOff = new Array;
		for (var i=0; i<imgOffList; i++) {
			imgOff[i] = new Image();
			imgOff[i].src="/assets/templates/trios/images/dp/sub_nav/" + dirName + "/" + imgOffList[i];
		}
	}
}

function setActive()
{
	var imgObj = document.getElementById('menu_' + currentPage);
	
	if (imgObj) {
		imgObj.src = imgObj.src.replace('_off.jpg','_on.jpg');
	}
}

// Function to 'activate' images.
function subImgOver(imgObj) {
	var imgId = imgObj.id.replace('menu_', '');
	
	if (imgId != currentPage) {
		imgObj.src = imgObj.src.replace('_off.jpg','_on.jpg');
	}
}

// Function to 'deactivate' images.
function subImgOut(imgObj) {
	var imgId = imgObj.id.replace('menu_', '');
	
	if (imgId != currentPage) {
		imgObj.src = imgObj.src.replace('_on.jpg','_off.jpg');
	}
}