SMS Merge two FormFields to make one value

[Tom]

Hi there,

I have a textarea for an sms text and need to be able to add some
characters to the end of the users input. The sender number cannot be
used to reply to, so I would like to add the site name at the end of
the message.

So what would be the syntax?

At the moment I have:

<textarea name=Message wrap=physical cols=22 rows=3
onKeyDown="textCounter(this.form.Message,this.form.remLen,160);"
onKeyUp="textCounter(this.form.Message,this.form.remLen,160);"></textarea>

How do I add and send the characters "//sms.hac.net" at the end of the
user's input from the above field?

Thanks
Thomas Hackett