Feeding data from php form to Web link

Ok so what I have is a basic form with two fields D and M. when the person enters D and M and clicks Submit I want the contents of D and M to fill their respective areas of a web link.
This is the link.
site.net/sendsms.aspx?s=m&d=085654321&m=Hi

Any ideas?
Thanks

Marty

 

<form action="http://site.net/sendsms.aspx" method="get">
<p>D: <input type="text" name="d" /></p>
<p>M: <input type="text" name="m" /></p>
<input type="submit" value="Submit" />
</form>

HTML:

Like this?

 

Thanks for the help. I will let you know how I get on. Im not too good at php.
Cheers.

 

It's just simple HTML.