// define browser version
var browserVersion = parseInt(navigator.appVersion);

// preload images
function imgPreload (numLeftLinks, numTopLinks) {
	var numTopLinks = 6;

	var imgTopLinks = new Array (numTopLinks);
	var imgTopLinksOver = new Array (numTopLinks);

	if (browserVersion > 2) {
	  for (i = 0; i < numTopLinks; i++) {
	    imgTopLinks[i] = new Image();
	    eval ('imgTopLinks[' + i + '].src = "img/design/top-link' + (i + 1) + '.gif"');
	    imgTopLinksOver[i] = new Image();
	    eval ('imgTopLinksOver[' + i + '].src = "img/design/top-link' + (i + 1) + '-over.gif"');
	  }
	}

	return true;
}

// substitute images
function imgLoadOver (linkName) {
	if (browserVersion > 2) {
		eval ('document[linkName].src = "img/design/" + linkName + "-over.gif"');
 	}
}

function imgLoad (linkName) {
	if (browserVersion > 2) {
		eval ('document[linkName].src = "img/design/" + linkName + ".gif"');
	}
}