กำหนดค่า default ให้กับ listbox จะกำหนดค่า default ให้กับ listbox ยังไงหรอคะ

          <select style="width:140px" name="s_tran" id="s_tran">
            <option value="1">โอนแล้ว</option>
            <option value="2" selected="selected">ยังไม่โอน</option>
          </select>

function projectSelectWithOptGroup( $user_id, $select_name, $select_attribs, $selected, $excludeProjWithId = null ) {
    global $AppUI ;
    $q = new DBQuery();
    $q->addTable('projects');
    $q->addQuery('project_id, co.company_name, project_name');
		if (!empty($excludeProjWithId)){
			$q->addWhere('project_id != '.$excludeProjWithId);
		}
    $proj = new CProject();
    $proj->setAllowedSQL( $user_id, $q );
    $q->addOrder('co.company_name, project_name');
    $projects = $q->loadList();
    $s = "\n<select name=\"$select_name\" $select_attribs>";
    $s .= "\n\t<option value=\"0\" " . ( $selected == 0 ? "selected=\"selected\"" : "" ) ." >" . $AppUI->_('None') . "</option>" ;
    $current_company = "";
    foreach ($projects as $p )
        {
        if ( $p['company_name'] != $current_company )
            {
            $current_company = $p['company_name'];
            $s .= "\n<optgroup label=\"" . $current_company . "\" >" . $current_company. "</optgroup>" ;
            }
        $s .= "\n\t<option value=\"".$p['project_id']."\"".($selected == $p['project_id'] ? " selected=\"selected\"" : '').">&nbsp;&nbsp;&nbsp;" . $p['project_name'] . "</option>";
        }
    $s .= "\n</select>\n";
    return $s;
}