gistfile1.php

  function check_upgrade() {
		
		// Check our version against the options table
		if (is_multisite()) 
			$options_version = get_site_option('wpmudev-chat-version');
		else
			$options_version = get_option('wpmudev-chat-version');
			
		if (version_compare($this->chat_current_version, $options_version) > 0) {
			$this->install();
			
			if (is_multisite())
				update_site_option('wpmudev-chat-version', $this->chat_current_version);
			else
				update_option('wpmudev-chat-version', $this->chat_current_version);
		}
	}