Hi,
The HTML code is something like this:
<img alt="" src="http://myurl.jpg">
Is that similar to what you're doing? If not, post your code. Note, Auctiva doesn't provide a full HTML codeset for implant in their copy box on the Image Management page. They're just providing the URL/http link.
Danno
Here's an online reference for coding the HTML IMG tag:
http://www.w3schools.com/tags/tag_img.asp