Unfortunately, to avoid spam, Shoporama needs to introduce captcha on some selected pages. We already have one built in, which we believe is a good compromise between usability and spam filtering. But if you want to design your own, you are welcome to do so.
We already have a captcha.html in Alaska that can be freely downloaded and used as a starting point.
Otherwise, the recipe for your own captcha is as follows:
Create a captcha.html in your theme with the minimum content below:
<form action="" method="post">
<{$form}>
<{if $error}>>
Error in the code, try again.
<{/if}>
<img src="<{$imgstr}>">
<input type="text" name="c">
<input type="submit" value="Ok">
</form>
In the above, you need to be aware of the following:
The form must be with method="post", and action must be empty or to current url.
$form must be included.
$error is used to indicate if there was an error in what was entered.
The field where the captcha is written in must have name="c".
The captcha (image) is in $imgstr.