code: private Parameters composeParameters(SubmitButton button, SubmitImage image, int x, int y) {
  		Parameters params = new Parameters();
  		for(FormElement element : this) {
  			String name = element.getName();
  			String value = element.getValue();
  			if(element instanceof Checkable) {
  				if(((Checkable)element).isChecked())
  					params.add(name, value != null ? value : "");
  			}
  			else if(element instanceof Select) {
  				Select select = (Select)element;
  				for(Select.Option option : select.getOptions())
  					if(option.isSelected())
  						params.add(select.getName(), option.getValue() != null ? option.getValue() : "");
  			}
  			else if(!(element instanceof SubmitButton) && !(element instanceof SubmitImage) && !(element instanceof Upload)) {
  				if(name != null)
  					params.add(name, value != null ? value : "");
  			}
  		}
  		if(button != null && button.getName() != null)
  			params.add(button.getName(), button.getValue() != null ? button.getValue() : "");
  		if(image != null) {
  			if(image.getValue() != null && image.getValue().length() > 1)
  				params.add(image.getName(), image.getValue());
  			params.add(image.getName() + ".x", "" + x);
  			params.add(image.getName() + ".y", "" + y);
  		}
  		return params;
  	}
docs: Returns the parameters containing all name value params beside submit button, image button, unchecked radio
  buttons and checkboxes and without Upload information.