bijzondere tekens

ik heb een gastenboek gemaakt met behulp van php, nu ben ik geen ster in programmeren en kamp ik dus al weken met het volgende probleem,
als een bericht verstuur en gebruik daar en &,!,<
teken in word deze niet weergegeven in het bericht dat verstuurd/geplaatst is..... help wat moet ik doen!!!!!!

dit is het php bestand:

<?php

$Submit = $_POST["Submit"];
$Name = $_POST["Name"];
$Email = $_POST["Email"];
$Website = $_POST["Website"];
$Comments = $_POST["Comments"];
$NumLow = $_REQUEST["NumLow"];
$NumHigh = $_REQUEST["NumHigh"];

$Name = ereg_replace("[^A-Za-z0-9 ]", "",$Name);
$Email = ereg_replace("[^A-Za-z0-9 \@\.\-\/\']", "",$Email);
$Website = eregi_replace("http://", "",$Website);
$Website = ereg_replace("[^A-Za-z0-9 \@\.\-\/\'\~\:]", "",$Website);
$Comments = eregi_replace("[^A-Za-z0-9 \@\&\.\-\/\'\~\:]", "",$Comments);

$Comments = eregi_replace('neuken', '****',$Comments);
$Comments = eregi_replace('kankerboeren', '****',$Comments);
$Comments = eregi_replace('terin', '****',$Comments);
$Comments = eregi_replace('kanker', '****',$Comments);
$Comments = eregi_replace('vagina', '****',$Comments);
$Comments = eregi_replace('tievus', '****',$Comments);
$Comments = eregi_replace('tyfus', '****',$Comments);
$Comments = eregi_replace('klote', '****',$Comments);
$Comments = eregi_replace('pik', '****',$Comments);
$Comments = eregi_replace('kut', '****',$Comments);
$Comments = eregi_replace('lul', '****',$Comments);
$Comments = eregi_replace('godverdomme', '@#%&^!#@!',$Comments);
$Comments = eregi_replace('homo', '****',$Comments);
$Comments = eregi_replace('flikker', '****',$Comments);
$Comments = eregi_replace('nicht', '****',$Comments);
$Comments = eregi_replace('hoer', '****',$Comments);
$Comments = eregi_replace('likker', '****',$Comments);
$Comments = eregi_replace('suck', '****',$Comments);
$Comments = eregi_replace('fuck', '****',$Comments);
$Comments = eregi_replace('slet', '****',$Comments);
$Comments = eregi_replace('aids', '****',$Comments);
$Comments = eregi_replace('nigt', '****',$Comments);
$Comments = eregi_replace('neuken', '****',$Comments);
$Comments = eregi_replace('shit', 'poep',$Comments);
$Comments = eregi_replace('neuke', '****',$Comments);
$Comments = eregi_replace('boeren', '****',$Comments);
$Comments = eregi_replace('hoeren', '****',$Comments);
$Comments = eregi_replace('nicht', '****',$Comments);
$Comments = eregi_replace('penis', '****',$Comments);
$Comments = eregi_replace('p1is', '****',$Comments);
$Comments = eregi_replace('boer', '****',$Comments);
$Comments = eregi_replace('kutwijf', '****',$Comments);
$Comments = eregi_replace('doos', 'lekker wijf',$Comments);
$Comments = eregi_replace('pisnicht', '****',$Comments);
$Comments = eregi_replace('&', 'en',$Comments);

$Name = stripslashes($Name);
$Email = stripslashes($Email);
$Website = stripslashes($Website);
$Comments = stripslashes($Comments);



if ($Submit == "Yes") {

$filename = "GuestBook.txt";

// Opens up the file declared above for reading

$fp = fopen( $filename,"r");
$OldData = fread($fp, 80000);
fclose( $fp );

// Gets the current Date of when the entry was submitted
$Today = (date ("l dS of F Y ( h:i:s A )",time()));

// Puts the recently added data into html format that can be read into the Flash Movie.
// You can change this up and add additional html formating to this area. For a complete listing of all html tags
// you can use in flash - visit: http://www.macromedia.com/support/flash/ts/documents/htmltext.htm

$Input = "Name: <b>$Name</b><br>Email: <b><u><a href=\"mailto:$Email\">$Email</a></u></b><br>Website: <b><u><a href=\"http://$Website\" target=\"_blank\">$Website</a></u></b><br>Comments: <b>$Comments</b><br><i><font size=\"-1\">Date: $Today</font><br><br>.:::.";

/* This Line adds the '&GuestBook=' part to the front of the data that is stored in the text file. This is important because without this the Flash movie would not be able to assign the variable 'GuestBook' to the value that is located in this text file */

$New = "$Input$OldData";

// Opens and writes the file.

$fp = fopen( $filename,"w");
if(!$fp) die("&GuestBook=cannot write $filename ......&");
fwrite($fp, $New, 800000);
fclose( $fp );
}

// ###################################################################################
// ######### Formatting and Printing the Data from the Guestbook to the Flash Movie ##



// Next line tells the script which Text file to open.
$filename = "GuestBook.txt";

// Opens up the file declared above for reading

$fp = fopen( $filename,"r");
$Data = fread($fp, 800000);
fclose( $fp );

// Splits the Old data into an array anytime it finds the pattern .:::.
$DataArray = split (".:::.", $Data);

// Counts the Number of entries in the GuestBook
$NumEntries = count($DataArray) - 1;

print "&TotalEntries=$NumEntries&NumLow=$NumLow&NumHigh=$NumHigh&GuestBook=";
for ($n = $NumLow; $n < $NumHigh; $n++) {
print $DataArray[$n];
if (!$DataArray[$n]) {
Print "<br><br><b>No More entries</b>";
exit;
}
}
?>