Adding Optional fields and dropdown to contact form

[Alin]

Hello everyone,

I have a contact form that works great, at least it did for what I needed up till now...Now I need to add optional fields to it and also a dropdown with 3 choices and I have no idea on how to do this...

I will provide my PHP and HTML below, some help will be highly appreciated.

PHP :

<?php

function validateEmail($value){
	return preg_match('/^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$/', $value);
}

if ( isset($_POST['last']) && $_POST['last']!="Name" && isset($_POST['email']) && $_POST['email']!="Email" && isset($_POST['message']) && $_POST['message']!="Message" ) {

	if ( validateEmail($_POST['email']) ) {


		$destination="My EMAIL";

		$subject="Contact Form";

		$mailMessage.="<dt><strong>Name:</strong></dt><dd>".$_POST['last']."</dd>";
		$mailMessage.="<dt><strong>E-mail:</strong></dt><dd>".$_POST['email']."</dd>";
		$mailMessage.="<dt><strong>Message:</strong></dt><dd>";  
		$mailMessage.=nl2br($_POST['message'])."</dd></dl>";
		$mailMessage = utf8_decode($mailMessage);




		$mailFrom=$_POST['email'];

		$mailHeader="From:".$mailFrom."\nReply-To:".$_POST['name']."<".$mailFrom.">\n"; 
		$mailHeader=$mailHeader."X-Mailer:PHP/".phpversion()."\n"; 
		$mailHeader=$mailHeader."Mime-Version: 1.0\n"; 
		$mailHeader=$mailHeader."Content-Type: text/html";


			if ( mail($destination,$subject,$mailMessage,$mailHeader) ) 
		{
			echo "<center><p style='color:#339966; font-family:Calibri;'> Thanks, got it! </p></center>";
		}			
		else echo "<center><p style='color:#339966; font-family:Calibri;'> Required fields are missing! </p></center>";

	}		
	else echo "<center><p style='color:#339966; font-family:Calibri;'> Invalid email! </p></center>";	//EMAIL VALIDATION ERROR

}
else echo "<center><p style='color:#339966; font-family:Calibri;'> Tsk..Tsk..Tsk! </p></center>";		//VARS ERROR		

?>

And my HTML:

<form id="myForm" method="post" action="contact.php" >
    <input type="text" value="Name" id="last" name="last" class="fields" onFocus="if(this.value == 'Name') {this.value = '';}" onBlur="if (this.value == '') {this.value = 'Name';}"><br/>

<input type="text" value="Email" id="email" name="email" class="fields" onFocus="if(this.value == 'Email') {this.value = '';}" onBlur="if (this.value == '') {this.value = 'Email';}"><br/>   

<textarea cols="20" rows="5" id="message" name="message" class="fields" onFocus="if(this.value == 'Message') {this.value = '';}" onBlur="if (this.value == '') {this.value = 'Message';}">Message</textarea><br/>

<center><input type="image" src="images/btn_trimite.png" border="0" name="submit" alt="Send"></center>
</form>