// image preloader
// loads a sequence of thumbnail images, named as
// s_t where s=set of images (category) and t=image
// to be performed before loading a landing page
// for a category of images
function preloadSet(whichSet, howMany) {
	document.preload = new Array();
	if (document.images) {
		for (var i = 1; i < howMany+1; i++) {
			document.preload[i] = new Image();
			document.preload[i].src = whichSet + "_" + i + "t.jpg";
		}
	}
}



var layersOK = document.all? true : false; // IE version 4 and above.

// thumbnail rollovers by FM 
function showThumb(imgName) {
	if (layersOK) {
		document.images.thumbImg.src = imgName + "t.jpg";
		document.all["thumbnails"].style.visibility = "visible";
	}
	else {
		document.thumbnails.document.images["thumbImg"].src = imgName + "t.jpg";
		document.layers["thumbnails"].visibility = "show";
	}
}

function hideThumb() {
	if (layersOK) {
		document.all["thumbnails"].style.visibility = "hidden";
	}
	else {
		document.layers["thumbnails"].visibility = "hidden";
	}
}