public function display()
 {
     $parentStr = parent::display();
     $char = $this->build('char', $this->char);
     $charoff = $this->build('charoff', $this->charoff);
     $valign = $this->build('valign', $this->valign);
     $this->str .= $parentStr . $char . $charoff . $valign;
     return $this->str;
 }
 public function display()
 {
     $parentStr = parent::display();
     $bgcolor = $this->build('bgcolor', $this->bgcolor);
     $border = $this->build('border', $this->border);
     $cellpadding = $this->build('cellpadding', $this->cellpadding);
     $cellspacing = $this->build('cellspacing', $this->cellspacing);
     $width = $this->build('width', $this->width);
     $this->str .= $parentStr . $bgcolor . $border . $cellpadding . $cellspacing . $width;
     return $this->str;
 }