Problems with mailform in PHP

Hi everyone, Its me again.
I read Kirupas tutorial on Mailform PHP and did as it said, but I cant get the mail thats supposed to reach me.
I tried it on the server, not directly through my compter and it doesnt work.
I really have no clue why it doesnt work, I dont have the AS nor the PHP here, but I will post it once I get them. Can anyone give me clues why it doesnt work in the meanwhile?
Im using If/else AS in case if certain variable isnt filled in the input text. The If says if that certain variables are null, it will display an error and the else does this (I think…)

form.loadVariables(“mailform.php”, “POST”);
nextFrame

the next frame is used in order to display a thank you message. It works fine, but problem is that once on the server, no mail whatever is sent. Ill try to get the PHP script as soon as I can to give you more clues on what i did.
THANXS A LOT!!!