function writeIframeAbout() {
var object = document.getElementById('response');
object.innerHTML = '<iframe src="about.html" frameborder="0" width="680" height="450" scrolling="no">';
}

function writeIframeHowTo() {
var object = document.getElementById('response');
object.innerHTML = '<iframe src="howto.html" frameborder="0" width="680" height="450">';
}

function writeIframeScreenshots() {
var object = document.getElementById('response');
object.innerHTML = '<iframe src="screenshots.html" frameborder="0" width="680" height="450" scrolling="no">';
}

function writeIframeDownload() {
var object = document.getElementById('response');
object.innerHTML = '<iframe src="download.html" frameborder="0" width="680" height="450">';
}


function loadImages() {
if (document.getElementById) {  // DOM3 = IE5, NS6
document.getElementById('hidepage').style.visibility = 'hidden';
}
else {
if (document.layers) {  // Netscape 4
document.hidepage.visibility = 'hidden';
}
else {  // IE 4
document.all.hidepage.style.visibility = 'hidden';
      }
   }
}