Need help with popup windows

On a site that I am creating, I wish to have a user click a button to obtain a window showing a coupon that they can print. I'm not concerned with the print button or code to print. But I am having problems creating a popup that will displaying the coupon information. I always receive a message within the popup stating that the page cannot be found.

Here's a snipit of the html i'm using to call a page named 'coupon.html'.

<form>
Input type="button" value="Click Here for Coupon" onclick="window.open('coupon.html')">
</form>

Would appreciate any answers you may have.

Make sure you have the correct path and the name and extention of the page are correct.

Check to make sure you have not saved the file as a .HTM and are calling a .HTML file

Thanks for the quick reply. That was the first thing I checked. However, I must have drank too much Holiday Cheer, for it was the difference between .html and htm.

Thanks...