code: public void setOnMouseDown(String onmousedown)
      {
          AbstractHtmlState tsh = getState();
          tsh.registerAttribute(AbstractHtmlState.ATTR_JAVASCRIPT, ONMOUSEDOWN, onmousedown);
      }
docs: Sets the onMouseDown javascript event.
  @param onmousedown the onMouseDown event.
  @jsptagref.attributedescription The onMouseDown JavaScript event.
  @jsptagref.databindable false
  @jsptagref.attributesyntaxvalue <i>string_onMouseDown</i>
  @netui:attribute required="false" rtexprvalue="true"
  description="The onMouseDown JavaScript event."