First attempt at a CSS website

Hello,

I've recently started to explore with CSS. I've built a few websites before, but without CSS. With my website, I tried creating style sheets from scratch, but I didn't have much luck. So, I used an already-built website to model mine after. I used the basic layout and changed most of the colors, fonts, sizes, etc. Because I don't want to be accused of plagarism, I'm still planning on changing the layout some more. Only a little bit of the content is there, but I wanted to get the layout working first. However, I tried testing my site in Safari, Firefox, and IE, but only Firefox worked, and that was only half of the time. Could someone please help me? I can't figure out why the pages only load with the text, and no style. When I preview the pages in Adobe GoLive, everything seems okay, but online it's not.

http://home.earthlink.net/~bgrinnell/index.html

Thanks,
Spencer Grinnell