How can I make this work..

[Sesquipedalian]

How can I get it so this actually works?.. :/ I keep getting the errors

Warning: fread(): supplied argument is not a valid stream resource in /home/adam/public_html/majyk/edit.php on line 9

Warning: fclose(): supplied argument is not a valid stream resource in /home/adam/public_html/majyk/edit.php on line 11

Warning: Cannot modify header information - headers already sent by (output started at /home/adam/public_html/majyk/edit.php:9) in /home/adam/public_html/majyk/edit.php on line 16

Warning: fread(): supplied argument is not a valid stream resource in /home/adam/public_html/majyk/edit.php on line 24

Warning: fwrite(): supplied argument is not a valid stream resource in /home/adam/public_html/majyk/edit.php on line 29

Warning: fclose(): supplied argument is not a valid stream resource in /home/adam/public_html/majyk/edit.php on line 39

The main page where the errors are:

<?
$ref = $_SERVER["HTTP_REFERER"];
$blank="";
function form($add)
	{
	echo "<form id='form1' name='form1' method='post' action='edit.php'>
  		  Filename:
    	  <input name='filename' type='text' id='filename' value='' />"
	   . $add
	   . "<input type='submit' name='Submit' value='Submit' />
		  </form>";
	}

if (!$ref="edit.php") 
	{
		form($blank);
	}
else
	{
		include("edit.php");
		form($filetext); 
	}
?>

Edit.php

<?

#####################################################################
#			Define $filetext, ane refer back to form.php			#
#####################################################################
$edit = $_POST['edit'];
$filename = $_POST['filename'];
	$file=fopen($filename, "r");
	$read=fread($file, 900000);
		$filetext="<br /><br />Edit:<br /><textfield name='edit' id='edit'>$read</textfield>";
	fclose($file);

$ref = $_SERVER["HTTP_REFERER"];
	if ($ref="form.php")
		{
		header("Location: form.php"); 
		}



#########################################################
#					Edit $filename						#
#########################################################
$file_read=fread($edit_file, 90000);	
$edit_file=fopen($filename, "w+");

if (!$edit=$file_read)
	{
	fwrite($edit_file, $edit);
	}
elseif (!$file_read=$edit)
	{
	echo "Error";
	} 
elseif ($file_read=$edit)
	{
	echo $filename . "has been sucessfuly edited";
	}
fclose($edit_file);
?>

[halojoy]

maybe you should OPEN before you read

$edit_file=fopen($filename, "w+");
$file_read=fread($edit_file, 90000);

also in several places
you use only = instead of ==
in your IF STATEMENTS
if ($ref="form.php") should be: if ($ref=="form.php")

and so on ....

about your first error Line 9
check out that your file permissions are 755 or 644 CHMOD
And maybe that file is empty - nothing to read?
I dont remember, but maybe reading an empty file will give some error.
best to use a check of ... filesize( $filename) ... BEFORE trying to OPEN file.

and you also should turn on DEBUG Mode
whilestarting your php page like this:

<?php
error_reporting(2047); // debug

//rest of page

[Sesquipedalian]

Thanks..