function openHere( $style, $a = 0, $b = 0, $c = 0 )
    {
        // this function will open the document at a specified page, in a specified style
        // the values for style, and the required paramters are:
        // 'XYZ'  left, top, zoom
        // 'Fit'
        // 'FitH' top
        // 'FitV' left
        // 'FitR' left,bottom,right
        // 'FitB'
        // 'FitBH' top
        // 'FitBV' left
        $this->numObj++;
        $this->o_destination( $this->numObj, 'new', array( 'page' => $this->currentPage,
                                                           'type' => $style,
                                                           'p1' => $a, 'p2' => $b, 'p3' => $c ) );
        $id = $this->catalogId;
        $this->o_catalog( $id, 'openHere', $this->numObj );
    }