changing the doctype

I've got the dtd's

[theonliest]

A strange request perhaps, but does anyone know how I can change a pages doctype depending on what browser is viewing it?

Basically I've built a page using css-p and with a strict doctype, but it's seriously crashing on IE5 for the mac (the client is an avid mac fan (aren't they all!)) but is useable on mac if I put in a 'quirky' doc type.

So, basically I need to just change the first line, not the whole page, is this a pointless exercise?

[encyclo]

If you're using a server-side scripting language such as PHP, it is quite easy to do - you check the user agent string and return the appropriate doctype whether it's a Mac or something else. If you're using static pages, I'm not sure you can do much.

[theonliest]

thanks for that but I really don't want to get into PHP (possibly because I know nothing about it!)

what I'd really like to do is to get my page to vertically center as desicribed here [wpdfd.com] but with a 'stict' doctype, which is wot's throwing it off in IE5mac

may have to revert to tables, so much for progress!