shell bypass 403
<?php
// Check to ensure this file is included in Joomla!
defined('_JEXEC') or die('Restricted access');
jimport('joomla.form.formfield');
class JFormFieldtextpx extends JFormField {
protected $type = 'textpx';
// getLabel() left out
public function getInput() {
return '<div class="input-append">'.
'<input class="input-medium" type="text" name="' . $this->name . '" id="' . $this->id . '"' . ' value="'
. htmlspecialchars($this->value, ENT_COMPAT, 'UTF-8') . '"/>'.
'<span class="add-on">px</span>'.
'</div>';
}
}