It's a children's song. It starts:

Chag Purim, Chag Purim,
Chag Gadol Layehudim (i think)

The rest?

could you please transliterate 3rd and 4th lines and the very last word? (so that i won't be making up the words, as i see i already did with "yehudim")

thanks a lot

(and if you have time for the translation, i would really appreciate it)

LaYehudim is a popular version too; I just ripped this off the internet.
I would do the transliteration, but I have no patience to right now.

Here's a link to several purim songs (with translation and transliteration) sung by Rebbe Alter:
http://www.aish.com/purimmultimedia/purimm...Purim_Songs.asp

The one you want specifically is here:
http://aishfiles.com/audio/holidays/Purim/Chag_Purim.mp3

THANKS, Aishel! mine was on aish. after i listened to the second site you gave, i still couldn't figure out those words, but the first one has transliteration and translation - thanks a lot!

(my daughter is learning it in the daycare and all i could sing with her were the first and last 2 lines, no middle...)