diff --git a/Generator/CaptchaGenerator.php b/Generator/CaptchaGenerator.php
index 82247e5..2981c45 100644
--- a/Generator/CaptchaGenerator.php
+++ b/Generator/CaptchaGenerator.php
@@ -33,10 +33,10 @@ class CaptchaGenerator {
         // Draw random lines
         for ($t=0; $t<10; $t++) {
             $tcol = imagecolorallocate($i, 100+mt_rand(0,150), 100+mt_rand(0,150), 100+mt_rand(0,150));
-            $Xa = mt_rand(0, 120);
-            $Ya = mt_rand(0, 40);
-            $Xb = mt_rand(0, 120);
-            $Yb = mt_rand(0, 40);
+            $Xa = mt_rand(0, $width);
+            $Ya = mt_rand(0, $height);
+            $Xb = mt_rand(0, $width);
+            $Yb = mt_rand(0, $height);
             imageline($i, $Xa, $Ya, $Xb, $Yb, $tcol);
         }
 
@@ -44,15 +44,15 @@ class CaptchaGenerator {
         imagettftext($i, 28, 0, 5, 32, $col, dirname(__FILE__).'/Font/captcha.ttf', $this->value);
 
         // Distort the image
-        $X = mt_rand(0, 120);
-        $Y = mt_rand(0, 40);
+        $X = mt_rand(0, $width);
+        $Y = mt_rand(0, $height);
         $Phase=mt_rand(0,10);
         $Scale = 1.3 + mt_rand(0,10000)/30000;
         $Amp=1+mt_rand(0,1000)/1000;
-        $out = imagecreatetruecolor(120,40);
+        $out = imagecreatetruecolor($width, $height);
 
-        for ($x=0; $x<120; $x++)
-            for ($y=0; $y<40; $y++) {
+        for ($x=0; $x<$width; $x++)
+            for ($y=0; $y<$height; $y++) {
                 $Vx=$x-$X;
                 $Vy=$y-$Y;
                 $Vn=sqrt($Vx*$Vx+$Vy*$Vy);