I think the problem is not reached by the contents of the variables to the php file.
Can you try the following to see if it the content of the variables you're passing by POST?
Modifies the content of the file so that it is the following code:
PHP Code:
<?php
print_r($_POST); // print post variables
$subject ="Advertise from your site";
$message="$webaddress". "$image". "$adforus". "$aboutusersite";
$mail_from="$email";
$header="from: $name <$mail_from>";
$to ='myemail@hotmail.co.uk';
$send_contact=mail($to,$subject,$message,$header);
if($send_contact){
echo "Thank you for submiting your request.";
}
else {
echo "Unfortunately an error occurred while trying to send this message. Please
try again later";
}
?>
I added the line # 2 next text:
print_r ($ _POST);
I also have changed the comma "," by dot "."
Write a post on results you get when you run the modified script.