Index: branches/5.0.x/core/install.php
===================================================================
diff -u -r12365 -r12417
--- branches/5.0.x/core/install.php	(.../install.php)	(revision 12365)
+++ branches/5.0.x/core/install.php	(.../install.php)	(revision 12417)
@@ -1,6 +1,6 @@
 <?php
 /**
-* @version	$Id: install.php 12365 2009-08-22 19:11:51Z alex $
+* @version	$Id: install.php 12417 2009-09-02 14:49:44Z alex $
 * @package	In-Portal
 * @copyright	Copyright (C) 1997 - 2009 Intechnic. All rights reserved.
 * @license      GNU/GPL
@@ -1393,5 +1393,32 @@
 				$this->Done($errstr);
 			}
 		}
+
+		/**
+		 * Checks, that given button should be visible on current installation step
+		 *
+		 * @param string $name
+		 * @return bool
+		 */
+		function buttonVisible($name)
+		{
+			$button_visibility = Array (
+				'continue' => $this->GetNextStep() != -1 || ($this->stepsPreset == 'already_installed'),
+				'refresh' => in_array($this->currentStep, Array ('check_paths', 'security')),
+				'back' => in_array($this->currentStep, Array (/*'select_license',*/ 'download_license', 'select_domain')),
+			);
+
+			if ($name == 'any') {
+				foreach ($button_visibility as $button_name => $button_visible) {
+					if ($button_visible) {
+						return true;
+					}
+				}
+
+				return false;
+			}
+
+			return array_key_exists($name, $button_visibility) ? $button_visibility[$name] : true;
+		}
 	}
 ?>
\ No newline at end of file