Script Works, Butn I Get Weird Notices

[XGD]

Hello people,I've made this registration script that actually works, but i get weird problems when i try to submit it with empty fields or when i try to use 2 different passwords while registering.If i try to submit it without entering anything into the fields, i get the following error message:Didnt fill in FIRST NAMEDidnt fill in LAST NAMEDidnt enter EMAILDidnt enter passNotice: Undefined variable: fn in C:\Program Files\EasyPHP 3.0\www\register.php on line 76And if i try to submit it using 2 different passwords i get this:Passwords dont matchNotice: Undefined variable: p in C:\Program Files\EasyPHP 3.0\www\register.php on line 76so the script actually works, it registers normally if everything is OK, and it doesnt register if something is not valid, but i get these weird error messages of undefined variables that i believe i have defined.the script goes like this:

<?php// SET UP THE DATA INPUT FIELDS  if (isset($_POST['submit'])) {   	require_once('db_connect.php');		if (empty($_POST['first_name'])) {		   echo "Didnt fill in FIRST NAME<br />";	   } else {	   		  $fn = trim($_POST['first_name']);		  		  }		  		  	if (empty($_POST['last_name'])) {		   echo "Didnt fill in LAST NAME<br />";	   	   } else {	   	   $ln = trim($_POST['last_name']);	   	   }	   	   if (empty($_POST['email'])) {	   		  echo "Didnt enter EMAIL<br />";		  } else {		  			 $e = trim($_POST['email']);			 			 }			 			 	  if (!empty($_POST['pass1'])) {	  	  if ($_POST['pass1'] != $_POST['pass2']) {	  		 echo "Passwords dont match<br />";		 } else {		 		 $p = trim($_POST['pass1']);		 }		 }		 else {		 echo "Didnt enter pass<br />";		 }		 if (@$fn && $ln && $e && @$p) {		 		 // MAKE SURE EMAIL ADDRESS IS NOT ALREADY IN USE$q = "SELECT user_id FROM users WHERE email='$e'";$r = mysqli_query($dbc, $q) or trigger_error("Problem with query".mysqli_error($dbc));if (mysqli_num_rows($r) == 0) {   $q = "INSERT INTO users (email, pass, first_name, last_name, reg_date) VALUES ('$e', SHA1('$p'), '$fn', '$ln', NOW() )";      $r = mysqli_query($dbc, $q) or trigger_error("error inserting".mysqli_error($dbc));      if (mysqli_affected_rows($dbc) == 1) {   	   echo "you have been regiatered";	   } else {	   echo "System error, you could not be registered";	   }	   }	   else {	   echo "Email address already in use, choose another one";	   }	   }	   }	   ?>

[jlhaslip]

where is line 76?

[pizzaguy]

try just putting this at the beginning of the script:

$fn = NULL;$ln = NULL;$e = NULL;$p = NULL;