sample code for undestand php file handling functions

$comment = $_POST["txtcomment"];

if ($comment!=""){

$date=date('l dS \of F Y h:i:s A');

$massage = $date.": ".$comment."\n";

$file=fopen("comment.txt","a+") or exit("Unable to open file!");

fwrite($file,$massage) or die("Could not write to file");

fclose($file);

echo "Massage sent!";

}

?>

This will write the massage to the comment.txt file.

javascript mail validation (check)

var filter = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;

if (!filter.test(txtEmail.value)) {

alert('Please provide a valid email address');

txtEmail.focus();

return false;

}

use this javascript function to validate email addresses.