Interesting, I checked this with firefox and the marquee works. I always thought that was an IE only feature.
Anyways I checked the errors in firefox and I get the following warnings:
1)Selector expected. ruleset ignored due to bad selector. line 16 of rebirth.css.
2)Element referenced by ID/NAME in global scope use standard document.getElementById() instead. Line 1
You are lacking a DTD at top of your page. For example a strict dtd will look like the following:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
There is a transitional, strict, frames, and xhtml version available. Check out W3C.org HTML 4.01 DTD Info
It is very important to use a DTD at the top of all of your html pages. This tells the browser how to deal with the tags. This can effect the size of your tags, etc. In fact if you use the validator on w3c's website, the dtd is required to pass validation.
I highly recommend that you get use to the more strict dtd's as it will be more beneficial to you in the future. At first it may be more difficult as some of the tags no longer work in the more stricter dtd's but one day the browsers may require that you use the more up to date features and won't support the older tags. I have no clue when that will happen, but I beleive it is better to learn the new style while you can still use the old style. There is nothing like trying to get your code to work and all you get are cryptic error messages.