Server Error in '/contact.php' Application

Line 435:   	}
Line 436:   
Line 437:   	/** Sets the control to render in the given cell */
Line 438:   	function SetCellControl($ctl, $col, $row = -1)		
Line 439:   	{
Line 440:   		lib_Assert(is_a($ctl, "HTMLControl"), sprintf("value should be a HTMLControl [%s]", gettype($ctl)) );
Line 441:   		if ($row == -1) { $row = ($this->m_rows) - 1; }	//Assume the last row if none specified
Line 442:   		$this->m_controls[$row][$col] = $ctl; 
Line 443:   		if (!isset($this->m_cells[$row][$col])) { $this->m_cells[$row][$col] = ""; }
Line 444:   		$this->m_cols = max($this->m_cols, $col+1);
Line 445:   	}

lib_ErrorHandler(2048, 'is_a(): Deprecated. Please use the instanceof operator', '/export/home/flathead/propus/webs/www.propus.co.uk/php/common/html.php', 440, Array
(
    [ctl] => HTMLTextBox Object
        (
            [m_maxLength] => 50
            [m_type] => 1
            [m_value] => 
            [m_displayError] => 
            [m_error] => 
            [m_mandatory] => 1
            [m_showError] => 1
            [m_caption] => 
            [m_CSSClass] => 
            [m_height] => 0
            [m_id] => person
            [m_script] => Array
                (
                    [onkeypress] => 
                )

            [m_style] => 
            [m_toolTip] => 
            [m_width] => 295
        )

    [col] => 1
    [row] => -1
)
)
is_a(HTMLTextBox, 'HTMLControl') in /export/home/flathead/propus/webs/www.propus.co.uk/php/common/html.php line 440
HTMLTable->SetCellControl(HTMLTextBox, 1) in /export/home/flathead/propus/webs/www.propus.co.uk/php/common/form.class.php line 811
Form->Render() in /export/home/flathead/propus/webs/www.propus.co.uk/php/common/form.class.php line 505
Form->BindPage(Page, 'content') in /export/home/flathead/propus/webs/www.propus.co.uk/htdocs/contact.php line 93

Array
(
    [SessionID] => 1337444505c6fb28173381ac7fa717719aa44bbeac
)

Array
(
    [SCRIPT_URL] => /contact.php
    [SCRIPT_URI] => http://www.propus.co.uk/contact.php
    [HTTP_X_CC_ID] => ccc03-01
    [HTTP_HOST] => www.propus.co.uk
    [HTTP_USER_AGENT] => CCBot/1.0 (+http://www.commoncrawl.org/bot.html)
    [HTTP_ACCEPT] => text/html,application/xhtml+xml,text/xml;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5
    [HTTP_ACCEPT_LANGUAGE] => en-us,en;q=0.5
    [HTTP_ACCEPT_ENCODING] => gzip
    [HTTP_ACCEPT_CHARSET] => ISO-8859-1,utf-8;q=0.7,*;q=0.7
    [HTTP_CONNECTION] => close
    [HTTP_CACHE_CONTROL] => no-cache
    [HTTP_PRAGMA] => no-cache
    [HTTP_COOKIE] => SessionID=1337444505c6fb28173381ac7fa717719aa44bbeac
    [HTTP_X_FORWARDED_FOR] => 38.107.179.228
    [PATH] => /usr/local/bin:/usr/bin:/bin
    [SERVER_SIGNATURE] => 
    [SERVER_SOFTWARE] => Apache/2.2.9 (Debian) PHP/5.2.6-1+lenny16 with Suhosin-Patch mod_python/3.3.1 Python/2.5.2 mod_ssl/2.2.9 OpenSSL/0.9.8g mod_perl/2.0.4 Perl/v5.10.0
    [SERVER_NAME] => www.propus.co.uk
    [SERVER_ADDR] => 212.11.72.73
    [SERVER_PORT] => 80
    [REMOTE_ADDR] => 38.107.179.228
    [DOCUMENT_ROOT] => /home/propus/webs/www.propus.co.uk/htdocs/
    [SERVER_ADMIN] => stuart.worswick@tiscali.co.uk
    [SCRIPT_FILENAME] => /home/propus/webs/www.propus.co.uk/htdocs/contact.php
    [REMOTE_PORT] => 42766
    [GATEWAY_INTERFACE] => CGI/1.1
    [SERVER_PROTOCOL] => HTTP/1.1
    [REQUEST_METHOD] => GET
    [QUERY_STRING] => 
    [REQUEST_URI] => /contact.php
    [SCRIPT_NAME] => /contact.php
    [PHP_SELF] => /contact.php
    [REQUEST_TIME] => 1337444537
    [argv] => Array
        (
        )

    [argc] => 0
)