(font size=+1 color=red)&hearts:(u)Happy Birthday Firecat(/u)&hearts:(/font)

Now, replace all the () with <> and : with ; and it should work. The "u" should make the underline and the "/u" should stop the underline. The "/font" will end the font tag. Just don't forget to use These <> signs where I used these ().

For more symbols (other than hearts) there is This Page which I believe Noreen lead me to.

If you have other questons, just ask. Somebody around here will know.