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$tpl->load_template ( 'main.tpl' );

$f_ = ($newsid !== 0) ?
        'main_' . $cat_info[$category_id]['alt_name'] . '.tpl' :  
        (($do == 'cat') ? 'main_' . $category . '.tpl' : 'main.tpl' );
        if (file_exists(TEMPLATE_DIR . '/'. $f_)) {
                $catTemplate = $f_;
        }else{
                $parentid_ = $cat_info[$category_id]['parentid'];
                $alt_name_cat_ = $cat_info[$parentid_]['alt_name'];
                while (isset($alt_name_cat_))
                {
                        if (isset ($alt_name_cat_)&file_exists(TEMPLATE_DIR . '/'. 'main_' . $alt_name_cat_ . '.tpl')) {
                                $catTemplate =  'main_' . $alt_name_cat_ . '.tpl';
                                break;
                        }else{
                                $parentid_ = $cat_info[$parentid_]['parentid'];
                                $alt_name_cat_ = $cat_info[$parentid_]['alt_name'];
                        }
                }
        }
        $catTemplate = isset ($catTemplate)&&(file_exists(TEMPLATE_DIR . '/'. $catTemplate)) ? $catTemplate : 'main.tpl';
        if( $do !== 'cat' && $do){
        if(file_exists(TEMPLATE_DIR . '/'. 'main_' . $do . '.tpl')){$catTemplate = 'main_' . $do . '.tpl';}
        else{$catTemplate = 'main.tpl';}
        }
        $tpl->load_template ( $catTemplate );

main_آدرس موضوع.tpl  

main_pm.tpl
main_feedback.tpl