Dynamic water marking (redirect?)

Not sure if this pertains to this group but I hope so.

I am dynamically loading several image 20+ on a site and watermarking them on the fly.

Example:
<img src='fss_scripts/watermark_image.php?src=/iq/lifestyle_images/men/{$men_lifestyle_image[0]}&watermark_src={$watermark_src}&location=life_style' width='228' style='margin-left:3px;' />

In FF and IE there is no issue.

However in Safari I am getting a 'too many redirects...' error.

Does this code represent a 'redirect' since it is loading a separate file in the image src or should I look for a problem elsewhere.

Thanks
.