var graphics_dir = 'http://www.metacraft.com/graphics/';
var image_extension = '.gif';
var highlight_suffix = '_hl';
var navbar_items = new Array ('managed_hosting', 'site_development', 'partners', 'clients', 'contact', 'home');

// Pre-load the highlight images.
for (var i = 0; i < navbar_items.length; i ++) {
	eval ('pic' + i + ' = new Image();');
	eval ('pic' + i + '.src = graphics_dir + navbar_items[i] + highlight_suffix + image_extension;');
}

// Highlight the specified image.
function highlight (target) {
	var item = target.src.substring (target.src.lastIndexOf ('/') + 1, target.src.lastIndexOf ('.'));
	target.src = graphics_dir + item + highlight_suffix + image_extension;
}

// Remove the highlight from the specified image.
function unhighlight (target) {
	var item = target.src.substring (target.src.lastIndexOf ('/') + 1, target.src.lastIndexOf (highlight_suffix + '.'));
	target.src = graphics_dir + item + image_extension;
}