Pop up window

hie guys

i have done a full flash site and everything else is working great but im failing to do is a pop up window, what i did is that the window that i want to pop up is called.htm, probably this states that its an html file, i tried the tutorial for centered pop up window, but it didi not work, it was poping up but was blank and giving me a syntax error which i could not fix. pliz people i need your help