no that wont work, because in Maya 7, the command polyHelix is a pre-scripted primitive. So if you try that in Maya 6.5 or 6, it will just give you a syntax error. And as for the other signs after the polyHelix command, they are not needed; they just tell the dimensions of the helix.
As for a script, why don't you just go to google.com and search for helix script in maya 6.5? Im sure you will find something.
hope that helps.
Live the life you love, love the life you live