CSS
<style type="text/css">  #botty {display:none;} <style>

Javascript
<script type="text/javascript">

function checkform(form){

// check first name
if (form.FirstName.value == "") {
alert( "Please enter your First Name." );
form.FirstName.focus();
return false ;
}

// check last name
if (form.LastName.value == "") {
alert( "Please enter your Last Name." );
form.LastName.focus();
return false ;
}

// check email field
if (form.email.value == "") {
alert( "Please enter your Email Address." );
form.email.focus();
return false ;
}

// check for valid email addy
var apos=form.email.value.indexOf("@");
var dotpos=form.email.value.lastIndexOf(".");

if (apos<1||dotpos-apos<2){
alert("Not A Valid Email Address!");
return false;
}

// ** END **
return true ;

}
</script>



HTML
<form action="contact_handle.php" method="post" name="formy" id="formy">
<p>* Required</p>
<table cellspacing="0" cellpadding="2" border="0" class="webform">
<tbody>
<tr>
<td><label for="Title">Title</label>
<br />
<select name="Title" id="Title" class="cat_dropdown_smaller">
<option value="126631">DR</option>
<option value="126629">MISS</option>
<option value="126627" selected="selected">MR</option>
<option value="126628">MRS</option>
<option value="126630">MS</option>
</select></td>
</tr>
<tr>
<td><label for="FirstName">First Name</label>
<br />
<input name="FirstName" type="text" class="cat_textbox" id="FirstName" size="35" maxlength="255" />
*</td>
</tr>
<tr>
<td><label for="LastName">Last Name</label>
<br />
<input name="LastName" type="text" class="cat_textbox" id="LastName" size="35" maxlength="255" />
*</td>
</tr>
<tr>
<td><label for="email">Email Address</label>
<br />
<input name="email" type="text" class="cat_textbox" id="email" size="35" maxlength="255" />
*</td>
</tr>
<tr>
<td><label for="comments">Comments/Enquiries</label>
<br />
<textarea name="comments" cols="45" rows="8" class="cat_listbox" id="comments" onkeydown="if(this.value.length&gt;=1024)this.value=this.value.substring(0,1023);"></textarea></td>
</tr>
<tr>
<td><input name="subscribe" type="checkbox" id="subscribe" value="yes" />
Subscribe to: Email List Signup</td>
</tr>
<tr>
<td><input type="submit" class="cat_button" value="Submit" id="catwebformbutton" />
<span id="formHide"><input type="text" id="botty" name="botty" /></span>
</td>
</tr>
</tbody>
</table>

</form>



PHP

<?php

//form data
$FirstName = strip_tags($_POST['FirstName']);
$LastName = strip_tags($_POST['LastName']);
$email = strip_tags($_POST['email']);
$subscribe = strip_tags($_POST['subscribe']);
$comments = strip_tags($_POST['comments']);

// prove if a bot has entered data
$botty = strip_tags($_POST['botty']);

if($botty != NULL){
echo "barghh! darn bot!";
die;
}


// the email address where the script will email the form results to
$to = "[email protected]";

// where the email will look like it is sent from
$from = "[email protected]";

$subject = "Email from your website";

$body = "Email from your website" . "
 
";
$body .= "Name: " . $FirstName . $LastName . "
";
$body .= "Email: " . $email . "
";
$body .= "Newsletter: " . $subscribe . "
";
$body .= "Comments: " . $comments . "
";

$headers = "From: $from" . "
";
$headers .= "Reply-To: $from" . "
";
$headers .= "Return-Path: $from" . "
";

// mail(to,subject,body,headers); 

$isMailed = mail($to, $subject, $body, $headers);

if($isMailed){
echo "Thank you for your inquery, " . $FirstName . " " . $LastName . " We will get back to you shortly.";
}else{
echo "There seemed to be a problem";
}

?>

CSS
<style type="text/css">  #botty {display:none;} <style>


HTML
<form action="contact_handle.php" method="post" name="formy" id="formy">
<p>* Required</p>
<table cellspacing="0" cellpadding="2" border="0" class="webform">
<tbody>
<tr>
<td><label for="Title">Title</label>
<br />
<select name="Title" id="Title" class="cat_dropdown_smaller">
<option value="126631">DR</option>
<option value="126629">MISS</option>
<option value="126627" selected="selected">MR</option>
<option value="126628">MRS</option>
<option value="126630">MS</option>
</select></td>
</tr>
<tr>
<td><label for="FirstName">First Name</label>
<br />
<input name="FirstName" type="text" class="cat_textbox" id="FirstName" size="35" maxlength="255" />
*</td>
</tr>
<tr>
<td><label for="LastName">Last Name</label>
<br />
<input name="LastName" type="text" class="cat_textbox" id="LastName" size="35" maxlength="255" />
*</td>
</tr>
<tr>
<td><label for="email">Email Address</label>
<br />
<input name="email" type="text" class="cat_textbox" id="email" size="35" maxlength="255" />
*</td>
</tr>
<tr>
<td><label for="comments">Comments/Enquiries</label>
<br />
<textarea name="comments" cols="45" rows="8" class="cat_listbox" id="comments" onkeydown="if(this.value.length&gt;=1024)this.value=this.value.substring(0,1023);"></textarea></td>
</tr>
<tr>
<td><input name="subscribe" type="checkbox" id="subscribe" value="yes" />
Subscribe to: Email List Signup</td>
</tr>
<tr>
<td><input type="submit" class="cat_button" value="Submit" id="catwebformbutton" />
<span id="formHide"><input type="text" id="botty" name="botty" /></span>
</td>
</tr>
</tbody>
</table>

</form>


##php##
  <?php

//form data
$FirstName = strip_tags($_POST['FirstName']);
$LastName = strip_tags($_POST['LastName']);
$email = strip_tags($_POST['email']);
$subscribe = strip_tags($_POST['subscribe']);
$comments = strip_tags($_POST['comments']);

// prove if a bot has entered data
$botty = strip_tags($_POST['botty']);

if($botty != NULL){
echo "barghh! darn bot!";
die;
}


// the email address where the script will email the form results to
$to = "[email protected]";

// where the email will look like it is sent from
$from = "[email protected]";

$subject = "Email from your website";

$body = "Email from your website" . "
 
";
$body .= "Name: " . $FirstName . $LastName . "
";
$body .= "Email: " . $email . "
";
$body .= "Newsletter: " . $subscribe . "
";
$body .= "Comments: " . $comments . "
";

$headers = "From: $from" . "
";
$headers .= "Reply-To: $from" . "
";
$headers .= "Return-Path: $from" . "
";

// mail(to,subject,body,headers); 

$isMailed = mail($to, $subject, $body, $headers);

if($isMailed){
echo "Thank you for your inquery, " . $FirstName . " " . $LastName . " We will get back to you shortly.";
}else{
echo "There seemed to be a problem";
}

?>

http://www.thatgrafix.com

A simple to use framework for a contact form.  This is missing some serious validation and such but is a good startin' point for any simple contact form. 

The input field named 'botty' is an input field we hide with css.. if data is sent to the handling file from that field then we know a non-human filled this form out.. and it kills the script.

** just added some simple jscript to handle some mild validation.

Simple PHP Contact Form + jscript validation + anti-bot

form, php, html

PHP