Themes NOT visible

Hi, I’ve got a BIG problem – Installed WP 1.5.2, set up my sql database (working OK I think), followed instructions, now I can login succesfully, I see the nice layout of admin pages, BUT… It is NOT the same for my website. I cannot see ANY theme loaded, I’ve tried with the default theme and others, but all I can see is only a plain-text layout of my pages, without ANY style visible (this means white background, black text, blue underlined links, etc.).
To check this out, go to

https://www.hellwrath.net

I’ve not received any other kind of errors, but it doesn’t seem to work properly… if anyone has got the answer, i would be happy to know about this, Thanks.