[Sunray Sales]

I am going take a shot in helping you.

I did use webmaster mode to tell me what tpl files to modify, in this case it is product-thumbnail.tpl.

Steve is correct in his statement
{if $login ne ""}
SHOW IMAGE
{/if}

I will give you some pseudo code and then you can properly put it in.

If user is not logged in then show jewelry1b.jpg.
If user is logged then show jewelry1.jpg.

Can replace the second statement with just and else statement instead of needing the second if statement.

The first if statement shows the blurred image, indicated by the "b" for the image.

I hope you can figure it out, but that's roughly how I would handle it.

Cheers.