SMS Call back widget

Hi all
I found a cool widget on someone’s site that allows a user to put in their name and phone number and click the ‘call me’ buttom which automatically sends a text to the owner of the site. I got the source code to do it but cant find the plugin for it to make it happen. Here is the code that i copied off the site:

<div id="sidebar">
	<ul class="widgets">
		<li class="widget callback">
			<h2 class="widgettitle">Busy? We'll call you.</h2>

							<p>We know there's not enough hours in the day. Simply enter your details below and we'll call you as soon as possible.</p>
						<form action="#" method="post">
			<table>
				<tr>
					<td><input id="callname" name="callname" type="text" value="" /></td>
				</tr>
				<tr>
					<td><input id="callphone" name="callphone" type="text" value="" /></td>

				</tr>
				<tr>
					<td><input id="callme" type="submit" class="button" value="Call Me" /></td>
				</tr>
			</table>
			</form>

Any ideas would be very much appreciated
Cheers,
Matt