Scrolling Background

Note: If I'd have made the header with a transparent background it would have had to be a GIF image, and with all the detail in the header graphic the file size would be unacceptably large.

Browsers other than Internet Explorer will see the standard background and will not get a JavaScript error. They will see no message or a message of your choice, but no errors.

How to do it, do it, do it:

<script type="text/JavaScript">
if( (navigator.appName.indexOf('Explorer') > -1) || 
(navigator.appName.indexOf('IE') > -1) )
{ 
var backgroundOffset = 0;
var bjSlide=eval('document.body');
function render(edify) {
backgroundOffset=backgroundOffset + 1;
if (backgroundOffset>edify) backgroundOffset = 0;
bjSlide.style.backgroundPosition = "0 " + backgroundOffset;
}
var ScrollTimer = window.setInterval("render(153)", 50);
} else {
document.writeln('<p>Message</p>');
}
</script>

Editable Parts

• In the third line up from the bottom, the line that begins with "document.writeln" - if you want to display a message on the page for non-Internet Explorer users, replace the word "Message" with your message. Do not use special characters in the message, and if you have to use an apostrophe, preface the apostrophe with a backslash. An apostrophe means something else in JavaScript. Prefacing the apostrophe with a backslash tells the browser to print the character rather than interpret it. Example:

  Boogie Jack\'s
  

  If you do not want to display a message to people using other browsers simply remove the word "Message" from the code, leaving just the <p></p> tags facing each other, or remove the line from the code—but be careful—you could get a nasty rash if you mess it up!

• In the following line:

  var ScrollTimer = window.setInterval("render(153)", 50);
  

  ...set the '153' to the height of your background image for the smoothest scrolling.

  ...set the '50' to the speed you want the background to scroll. The lower the number, the faster it will scroll. Do not set it to zero though, or it won't scroll at all.