Magento change Multiple select to dropdown with select all option in Advanced search

How to change Multiple select to dropdown with select all option in Advanced search - Magento. Simply change statement in ... Mage/Block/Advanced/Form.php around line 207 (Magento 1.7) if (is_array($options) && count($options)>2) to any number higher than the number of your attribute options: if (is_array($options) && count($options)>10000000) Example: Original code: if (is_array($options) && count($options)>2) {            $extra = 'multiple="multiple" size="4"';            $name.= '[]';        }        else {            array_unshift($options, array('value'=>'', 'label'=>Mage::helper('catalogsearch')->__('All')));        } My...

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