// used to tell functions when images are loaded

	var menuflag = 0;

// short names of each of the main menu buttons

	var options = new Array('buttonover','unchome','uncdir','uncdepts','uncsearch');

// empty arrays that will get filled with references to images

	var overImgs = new Array();
	var outImgs = new Array();

// path from this page to where the images are

	var imgPath = "img/buttons/";

// function preloads images for main menu rollovers

	function LoadMenu () {
		var n;
		
		if ( document.images ) {
			for ( n = 0; n < options.length; n++ ) {
				option_name = options[n];
				overImgs[option_name] = new Image(); overImgs[option_name].src = imgPath + option_name + "-on.gif";
				outImgs[option_name] = new Image(); outImgs[option_name].src = imgPath + option_name + "-off.gif";
			}
			menuflag = 1;
		}
	}

// function to show default menu button image

	function ShowOut ( id ) {
		if ( document.images ) {
			if ( menuflag ) {
				if ( id.indexOf('unc') != -1 ) { document.images[id].src = outImgs[id].src; }
				else { document.images[id].src = outImgs['buttonover'].src; }
			}
		}
	}

// function to display menu button mouseover image

	function ShowOver ( id ) {
		if ( document.images ) {
			if ( menuflag ) {
				if ( id.indexOf('unc') != -1 ) { document.images[id].src = overImgs[id].src; }
				else { document.images[id].src = overImgs['buttonover'].src; }
			}
		}
	}