I'm not sure why, but having your <iframe> height set to 100% works in Internet Explorer, but when viewed in Firefox it appears as a tiny window, instead of a tall window, as in IE.

Who knows! But it looks a bit offputting in IE. Like looking at a room through a letterbox.

While your site is clearly a work in progress, it might be best to not have the text in the links bar which don't do anything (Contact Us and Resources for Parents). It makes the site look a bit unfinished.

Also, not sure why you've used an iframe for your contact page. Again, look at it in Firefox, and you get a scroll bar floating in the middle of the page, which looks rather strange:

http://www.catchingperverts.co.uk/help.htm

It would seem easier just to put the HTML for the form on the "help.htm" page, rather than have it linked through to the contact page via the iframe.

Also, the big gap between your title image and navigation bar seems a bit large.

Anyway, apologies for the essay. Good luck with your site.

Jim