GetImageSize ERROR?

Anon

This function returns an error saying it can't open the file when permissions are correctly set and the file does in fact exist.

function getAvatars($curAvatar)
{

	global $cfg_avatar_dir, $prefix, $misc_avatar_maxwidth, $misc_avatar_maxheight, $cfg_avatar_url;
	$dirhandle = opendir($cfg_avatar_dir);

	while( $filename = readdir($dirhandle) ) 
	{
		$file = substr($filename, 0, -4);
		$file = eregi_replace("_", " ", $file);

		if( substr($file, 0, 5) == "basic" || ( strtolower($filename) == strtolower($curAvatar) && $curAvatar != "" ) )
		{			
			$sizestuff = GetImageSize("$cfg_avatar_dir/$filename");

			if( $sizestuff[0] <= $misc_avatar_maxwidth && $sizestuff[1] <= $misc_avatar_maxheight )
			{
				$file = ltrim(eregi_replace("basic", "", $file));
			}
		}
	}

	closedir($dirhandle);
}

Warning: getimagesize: Unable to open 'C:/blizzPHP/avatars/basic_bob.jpg' for reading. in C:\blizzPHP\sources\functions.php on line 185