diff --git a/htdocs/application/controllers/main.php b/htdocs/application/controllers/main.php
index 5081095..d88c650 100755
--- a/htdocs/application/controllers/main.php
+++ b/htdocs/application/controllers/main.php
@@ -401,7 +401,7 @@ class Main extends CI_Controller
 		$this->load->helper('captcha');
 
 		//get "word"
-		$pool = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ@';
+		$pool = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ@';
 		$str = '';
 		for ($i = 0;$i < 4;$i++) 
 		{
@@ -433,7 +433,7 @@ class Main extends CI_Controller
 		if ($this->config->item('enable_captcha')) 
 		{
 			$this->form_validation->set_message('_valid_captcha', 'The Captcha is incorrect.');
-			return $text == $this->db_session->userdata('captcha');
+			return strtolower($text) == strtolower($this->db_session->userdata('captcha'));
 		}
 		else
 		{
diff --git a/htdocs/application/views/defaults/paste_form.php b/htdocs/application/views/defaults/paste_form.php
index 83d1feb..0f460b8 100644
--- a/htdocs/application/views/defaults/paste_form.php
+++ b/htdocs/application/views/defaults/paste_form.php
@@ -110,7 +110,7 @@
 				<label for="captcha">Spam Protection
 					<span class="instruction">Type in the characters displayed in the picture.</span>
 				</label>
-                <img class="captcha" src="<?php echo site_url('view/captcha'); ?>?<?php echo date('U', mktime()); ?>" alt="captcha" width="110" height="25" />
+                <img class="captcha" src="<?php echo site_url('view/captcha'); ?>?<?php echo date('U', mktime()); ?>" alt="captcha" width="110" height="40" />
                 <input value="<?php if(isset($captcha_set)){ echo $captcha_set; }?>" type="text" id="captcha" name="captcha" tabindex="2" maxlength="32" />
 			</div>
 		</div>