i want to implement a free (sms) texting service to mobile phones on my website. how does one go about doing this and is there anywhere i can get the script from. please help

http://www.clickatell.com/

That might help. Although I think finding something like this that's not going to cost and will cover all the bases is going to be rather hard.

You have to go through a service provider to get to the phones, and as far as I know, they won't let you send SMS through them without paying.
Most phones, however, have an email address with them. Example: PHONENUMBER@vzwpix.com, send an email to that and it will be sent as a text message to the phone. That's free.