I am putting a captcha on my site, and am displaying the captcha with

However, there is still a very prominent border around the image.

I tried <img xsrc="captcha.php" border="0" />, but that didn't work at all. Only the border appeared, nothing else.

you gotta try something like this:
<img src="captcha.php" alt="Verification code" width="50" height="24">