Help please, Im new to this

Hi I'm trying to make a script its when I press the number -Not on numberpad- "1" key it will spam the letter "w" or any letter i set to it... The scipt I made is this:

Func main()
While 1
If _IsPressed("49") Then; 49 = 1
Send("w")
EndFunc
EndIf
WEnd

I'm trying to keep it as simple as possible, Thanks for the help ahead of time!