<?php
class EM_Galabrandstoresettings_Model_System_Config_Source_Attribute
{

    public function toOptionArray()
    {
        $attributes = Mage::getSingleton('catalogsearch/advanced')->getAttributes();
        $result = array();
        foreach($attributes as $attribute){
            $result[] = array(
                'value' =>  $attribute->getAttributeCode(),
                'label' =>  $attribute->getStoreLabel()
            );
        }
        return $result;
    }
}
?>