[Raimund]

to check if the file/image exists, replace the following in functions_bbcodeparse.php

// ###################### Start handle_bbcode_img_match #######################
// this is only called by handle_bbcode_img
function handle_bbcode_img_match($link)
{
	// IMPORTANT - REPLACE THE FOLLOWING 2 VARIALBS WITH YOUR INFORMATION
	$img_replacement = "images/buttons/imagebig.gif"; // <-- This is the button/image that will be displayed instead of the big image.
	$img_max_width = 640; // <-- This is the maximum width that an image is allowed to be viewed safely.
	
	$link = strip_smilies(str_replace('\\"', '"', $link));
	
	// remove double spaces -- fixes issues with wordwrap
	$link = str_replace('  ', '', $link);
	
	$img_width = getimagesize($link);
	if ($img_width[0] > $img_max_width) {
		srand((double)microtime()*1000000);
		$number = rand(10,100);

		$inp_string = "<a href=\"javascript:toggle_imgview('bigimg".$number."')\"><img src=\"".$img_replacement."\" alt=\"\" border=\"0\" /></a><br />\n";
		$inp_string .= "<div style=\"position:absolute;display:none;z-index:1;\" id=\"bigimg".$number."\"><img src=\"".$link."\" border=\"0\" alt=\"\" /></div>";

		return $inp_string;
		
	} else return '<img src="' .  $link . '" border="0" alt="" />';
}

with

// ###################### Start handle_bbcode_img_match #######################
// this is only called by handle_bbcode_img
function handle_bbcode_img_match($link)
{
	// IMPORTANT - REPLACE THE FOLLOWING 3 VARIALBS WITH YOUR INFORMATION
	$img_replacement = "images/buttons/imagebig.gif"; // <-- This is the button/image that will be displayed instead of the big image.
	$img_replacement2 = "images/buttons/imagenotexist.gif"; // <-- This is the button/image that will be displayed if file does not exist.
	$img_max_width = 640; // <-- This is the maximum width that an image is allowed to be viewed safely.
	
	$link = strip_smilies(str_replace('\\"', '"', $link));
	
	// remove double spaces -- fixes issues with wordwrap
	$link = str_replace('  ', '', $link);
	$image= ($link);

	if (@fclose(@fopen("$image", "r"))) { 
	$img_width = getimagesize($link);
	if ($img_width[0] > $img_max_width) {
		srand((double)microtime()*1000000);
		$number = rand(10,100);

		$inp_string = "<a href=\"javascript:toggle_imgview('bigimg".$number."')\"><img src=\"".$img_replacement."\" alt=\"\" border=\"0\" /></a><br />\n";
		$inp_string .= "<div style=\"position:absolute;display:none;z-index:1;\" id=\"bigimg".$number."\"><img src=\"".$link."\" border=\"0\" alt=\"\" /></div>";

		return $inp_string;
		
		} else return '<img src="' .  $link . '" border="0" alt="" />';
 	} else { 
		return '<img src="' .  $img_replacement2 . '" border="0" alt="" />';
 	}
}

Raimund