Internal script error - wrong session parameters

[jimc]

Script URL: http://www.highminded.co.uk/submit_link.html
Version of script: 1.5
Hosting company: 1and1
URL of phpinfo.php:
URL of session_test.php:
What terms did you try when SEARCHING for a solution:

Internal script error
and
wrong session parameters

Write your message below:
Hi, I've just installed v1.5. Using an iframe, I've tried to embed the links.php scritp into an HTML page. but I get the above error when I input a valid link.
I've tried using the links.php page only to input a valid link but no luck. I'm a novice - can anyone help? speak simply please![/b]

[Klemen]

Double-check your URL, I can't open it. Also upload session test and phpinfo files, you will find them in the topic titled "READ THIS BEFORE POSTING A NEW QUESTION!!"