diff --git a/index.php b/index.php
index e2373b9..bb66679 100644
--- a/index.php
+++ b/index.php
@@ -18,7 +18,7 @@ $GLOBALS['config']['defaultThumbSize'] = '120x90';
 // default size for thumbnail
 $GLOBALS['config']['onlyThumb'] = TRUE;
 // generate only thumbnail or generate thumbnail + 1280x1024 image
-$GLOBALS['config']['thumbSize'] = array(1 => '100x80', '120x90', '200x160', '300x240', '400x320', '500x400');
+$GLOBALS['config']['thumbSize'] = array('s' => '120x90', 'm' => '200x160', 'l' => '300x240', 'xl' => '400x320', 'xxl' => '500x400');
 // list of available size for thumb
 
 if (!file_exists('cache/config/genConf.php')) {
@@ -233,7 +233,7 @@ if ($_GET) {
   }
 
   $defUrl = $ui['url'];
-  if (isset($ui['s']) && (int)$ui['s']) {
+  if (isset($ui['s']) && array_key_exists($ui['s'], $GLOBALS['config']['thumbSize'])) {
     $width = $GLOBALS['config']['thumbSize'][$ui['s']];
   } else {
     $width = $GLOBALS['config']['defaultThumbSize'];
@@ -282,7 +282,7 @@ if ($_POST) {
 
   $defUrl = $ui['url'];
 
-  if (isset($ui['s']) && (int)$ui['s']) {
+  if (isset($ui['s']) && array_key_exists($ui['s'], $GLOBALS['config']['thumbSize'])) {
     $width = $GLOBALS['config']['thumbSize'][$ui['s']];
   } else {
     $width = $GLOBALS['config']['defaultThumbSize'];
@@ -347,7 +347,7 @@ if (empty($width)) {
     <?php
     if (!empty($success)) {
       echo '<div id="result">';
-      echo '<img src="', $success['thumb'], '?r=',      time(), '"/>';
+      echo '<img src="', $success['thumb'], '?r=',       time(), '"/>';
       echo '<p><label>', $width, '</label><input type="text" value="http://', $_SERVER['SERVER_NAME'], '/', $success['thumb'], '" onclick="this.select()"/></p>';
       if ($GLOBALS['config']['onlyThumb'] === false) {
         echo '<p><label>1280x1024</label><input type="text" value="http://', $_SERVER['SERVER_NAME'], '/', $success['normal'], '" onclick="this.select()"/></p>';