Hi everyone, I am doing a custom form for my Zen Cart. Can anyone tell me whats wrong with it?

I put both of them in my public_html/store directory. If you have any suggestions please be super clear since I am really new to this, thanks!

Here is my contactform.htm file:
HTML Code:
<form name="contactform" method="post" action="send_form_email.php">
<table width="450px">
<tr>
 <td valign="top">
  <label for="first_name">Name *</label>
 </td>
 <td valign="top">
  <input  type="text" name="name" maxlength="50" size="50">
 </td>
</tr>
<tr>
 <td valign="top">
  <label for="email">Email Address *</label>
 </td>
 <td valign="top">
  <input  type="text" name="email" maxlength="80" size="50">
 </td>
</tr>
<tr>
 <td valign="top"">
  <label for="products">Products(s) *</label>
 </td>
 <td valign="top">
  <input  type="text" name="products maxlength="100" size="50">
 </td>
</tr>

<tr>
 <td valign="top">
  <label for="Location">Location *</label>
 </td>
 <td valign="top">
  <input  type="text" name="location" maxlength="60" size="50">
 </td>
</tr>
<tr>
 <td valign="top">
  <label for="comments">Special Comments/ Instructions </label>
 </td>
 <td valign="top">
  <textarea  name="comments" maxlength="1000" cols="39" rows="6">
Here is my send_form_email.php file:
PHP Code:
<?php
if(isset($_POST['email'])) {
     
    
// EDIT THE 2 LINES BELOW AS REQUIRED
    
$email_to "[email protected]";
    
$email_subject "Quote Requested";
     
     
    function 
died($error) {
        
// your error code can go here
        
echo "We are very sorry, but there were error(s) found with the form you submitted. ";
        echo 
"These errors appear below.<br /><br />";
        echo 
$error."<br /><br />";
        echo 
"Please go back and fix these errors.<br /><br />";
        die();
    }
     
    
// validation expected data exists
    
if(!isset($_POST['name']) ||
        !isset(
$_POST['email']) ||
        !isset(
$_POST['products']) ||
        !isset(
$_POST['location']) ||
        !isset(
$_POST['comments'])) {
        
died('We are sorry, but there appears to be a problem with the form you submitted.');       
    }
     
    
$first_name $_POST['name']; // required
    
$last_name $_POST['email']; // required
    
$email_from $_POST['products']; // not required
    
$telephone $_POST['location']; // required
    
$comments $_POST['comments']; // not required
     
    
$error_message "";
    
$email_exp '/^[A-Za-z0-9._%-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}$/';
  if(!
preg_match($email_exp,$email_from)) {
    
$error_message .= 'The Email Address you entered does not appear to be valid.<br />';
  }
    
$string_exp "/^[A-Za-z .'-]+$/";
  if(!
preg_match($string_exp,$name)) {
    
$error_message .= 'Please enter your Name.<br />';
  }
  if(!
preg_match($string_exp,$products)) {
    
$error_message .= 'Please enter the products you would like a quote for.<br />';
  }
  if(
strlen($comments) < 2) {
    
$error_message .= 'The Comments you entered do not appear to be valid.<br />';
  }
  if(
strlen($error_message) > 0) {
    
died($error_message);
  }
    
$email_message "Form details below.\n\n";
     
    function 
clean_string($string) {
      
$bad = array("content-type","bcc:","to:","cc:","href");
      return 
str_replace($bad,"",$string);
    }
     
    
$email_message .= "Name: ".clean_string($name)."\n";
    
$email_message .= "Email: ".clean_string($email)."\n";
    
$email_message .= "Products: ".clean_string($products)."\n";
    
$email_message .= "Location: ".clean_string($location)."\n";
    
$email_message .= "Comments: ".clean_string($comments)."\n";
     
     
// create email headers
$headers 'From: '.$email_from."\r\n".
'Reply-To: '.$email_from."\r\n" .
'X-Mailer: PHP/' phpversion();
@
mail($email_to$email_subject$email_message$headers);  
?>
 
<!-- include your own success html here -->
 
Thank you for contacting us! We will be in touch with you very soon!
 
<?php
}
?>