link problem

Jeg har lavet et script hvor man skal skrive en URL til et avatar billed
mit problem er så bare at hvis jeg skriver: www.side.com/avatar.gif
så gemmer den det som http://www.minside.dk/www.side.com/avatar.gif

men hvis jeg skriver http://www.side.com/avatar.gif
så hvis jeg sætter http:// foran kan den godt finde ud af det er en anden side den skal finde billedet... men uden http:// tror den at det ligger på min side... og der er mange der bruger det og det er jo ikke alle der er klar over at de SKAL skrive http:// foran

her er mine sider (ved ikke hvad for en af dem den er galt med)
addtutorial.php

<?
ob_start();
include("config.php");
?>
<?PHP
//If the submit button is pressed
if($_POST['submit']){

//Get form data
$title = $_POST['title'];
$description = $_POST['description'];
$avatar = $_POST['avatar'];
$tutorial = $_POST['tutorial'];
$author = $logged['username']; 
$date = date("dS M Y");

//Insert Data Into Mysql Database
$results = mysql_query("INSERT INTO tutorials (id, title, description, avatar, tutorial, author, date)
VALUES ('', '$title', '$description', '$avatar', '$tutorial', '$author', '$date' )") or die('Error making query'.mysql_error());

//Tell the user that the staff member has been added
echo "Thank you! The staff member has successfully been added.";
}
//Now we end php and show the form
?>


<table width='90%' cellpadding='0' cellspacing='0' style='border:1px solid #00000000;'>
<tr>
<td>

<center><form action="<? $_SERVER['PHP_SELF'] ?>" method="post">
<table width=\\"400\\" align=\\"center\\" cellpadding=\\"2\\" cellspacing=\\"2\\">
<tr>
<td width="150">Title:</td>
<td><input name="title" type="text"></td>
</tr>
<tr>
              <td>Short description:</td>
<td><input name="description" type="text"></td>
</tr>
<tr>
              <td>Link to avatar:</td>
<td><input name="avatar" type="text"></td>
</tr>
<tr>
              <td valign="top">Tutorial:<br><br><br>
                <br>
               BBcode:<br><br>
			   
			   [b]text[/b]<br>
			   <b>text</b>
			   <br><br>
			   [i]text[/i]<br>
			   <i>text</i>
			   <br><br>
			   [u]text[/u]<br>
			   <u>text</u>
			   <br><br>
			   [u]www.site.com[/u]<br>
                <a href="www.site.com">www.site.com</a><br><br>
				[url=www.site.com]text[/u]<br>
                <a href="www.site.com">text</a><br><br>
				[img]www.danishdevils.dk/view.gif[/img]<br>
				<img src="images/view.gif">
				
				</td>
<td valign="top"><textarea name="tutorial" cols="30" rows="25"></textarea></td>
</tr>

<tr>
<td> </td>
<td><input name="submit" type="submit" value="Submit"></td>
</tr>
</table>
</form></center>
</td></tr>
</table>

<?
ob_start();
include("config.php");
?>

<?php
function bbcode_format ($str) {
    $str = htmlentities($str);

    $simple_search = array(
                '/\\[b\\](.*?)\\[\\/b\\]/is',                                
                '/\\[i\\](.*?)\\[\\/i\\]/is',                                
                '/\\[u\\](.*?)\\[\\/u\\]/is',                                
                '/\\[url\\=(.*?)\\](.*?)\\[\\/url\\]/is',                         
                '/\\[url\\](.*?)\\[\\/url\\]/is',                             
                '/\\[align\\=(left|center|right)\\](.*?)\\[\\/align\\]/is',    
                '/\\[img\\](.*?)\\[\\/img\\]/is',                            
                '/\\[mail\\=(.*?)\\](.*?)\\[\\/mail\\]/is',                    
                '/\\[mail\\](.*?)\\[\\/mail\\]/is',                            
                '/\\[font\\=(.*?)\\](.*?)\\[\\/font\\]/is',                    
                '/\\[size\\=(.*?)\\](.*?)\\[\\/size\\]/is',                    
                '/\\[color\\=(.*?)\\](.*?)\\[\\/color\\]/is',        
                );

    $simple_replace = array(
                '<strong>$1</strong>',
                '<em>$1</em>',
                '<u>$1</u>',
                '<a href="$1">$2</a>',
                '<a href="$1">$1</a>',
                '<div style="text-align: $1;">$2</div>',
                '<img src="$1" />',
                '<a href="mailto:$1">$2</a>',
                '<a href="mailto:$1">$1</a>',
                '<span style="font-family: $1;">$2</span>',
                '<span style="font-size: $1;">$2</span>',
                '<span style="color: $1;">$2</span>',
                );

    // Do simple BBCode's
    $str = preg_replace ($simple_search, $simple_replace, $str);

    // Do <blockquote> BBCode
    $str = bbcode_quote ($str);

    return $str;
}



function bbcode_quote ($str) {
    $open = '<blockquote>';
    $close = '</blockquote>';

    // How often is the open tag?
    preg_match_all ('/\\[quote\\]/i', $str, $matches);
    $opentags = count($matches['0']);

    // How often is the close tag?
    preg_match_all ('/\\[\\/quote\\]/i', $str, $matches);
    $closetags = count($matches['0']);

    // Check how many tags have been unclosed
    // And add the unclosing tag at the end of the message
    $unclosed = $opentags - $closetags;
    for ($i = 0; $i < $unclosed; $i++) {
        $str .= '</blockquote>';
    }

    // Do replacement
    $str = str_replace ('[' . 'quote]', $open, $str);
    $str = str_replace ('[/' . 'quote]', $close, $str);

    return $str;
}
?> 

<?PHP



$id = $_GET['id'];

$sql_events = mysql_query("SELECT * FROM tutorials WHERE id = '" . $id . "'") or die (mysql_error());
while ($row = mysql_fetch_array($sql_events)) {
$id = $row["id"];
$title = $row["title"];
$author = $row["author"];
$tutorial = bbcode_format($row["tutorial"]);

echo "
<table width=\\"400\\" align=\\"center\\" cellpadding=\\"2\\" cellspacing=\\"2\\">
	<tr>
		<td align=\\"center\\"><font size=\\"2\\" face=\\"Tahoma\\"><b>$title</b></font></td>
	</tr>
	<tr>
		<td align=\\"center\\"><b>Created by:</b> <a href=\\"index.php?page=Members&user=$author\\">$author</a></td>
	</tr>
	<tr>
		<td></td>
	</tr>
	<tr>
		<td align=\\"left\\" width=\\"350\\">$tutorial</td>
	</tr>
</table>
";
}
?>