/**
  * preparation de HTML2PDF::$SUBOBJ utilisé pour la création des sous HTML2PDF
  *
  * @return	null
  */
 protected function prepareSubObj()
 {
     $pdf = null;
     HTML2PDF::$SUBOBJ = new HTML2PDF($this->sens, $this->format, $this->langue, $this->unicode, $this->encoding, array($this->defaultLeft, $this->defaultTop, $this->defaultRight, $this->defaultBottom));
     // initialisation
     HTML2PDF::$SUBOBJ->setIsSubPart();
     HTML2PDF::$SUBOBJ->setTestTdInOnePage($this->testTDin1page);
     HTML2PDF::$SUBOBJ->setTestIsImage($this->testIsImage);
     HTML2PDF::$SUBOBJ->setTestIsDeprecated($this->testIsDeprecated);
     HTML2PDF::$SUBOBJ->setDefaultFont($this->defaultFont);
     HTML2PDF::$SUBOBJ->style->css =& $this->style->css;
     HTML2PDF::$SUBOBJ->style->css_keys =& $this->style->css_keys;
     HTML2PDF::$SUBOBJ->pdf->cloneFontFrom($this->pdf);
     HTML2PDF::$SUBOBJ->style->setPdfParent($pdf);
 }