function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		services_over = newImage("images/services-over.gif");
		about_over = newImage("images/about-over.gif");
		contact_over = newImage("images/contact-over.gif");
		preloadFlag = true;
	}
}

function writeEmail(host,username,text,extra) {
  document.write("<a href=\"mailto:"+username+"@"+host+"\" "+extra+">");
  if (text) {
    document.write(text);
  } else {
    document.write(username+"@"+host);
  }
  document.write("</a>");
}