function smile_format ($str) { 
    $str = htmlentities($str); 
    $simple_search = array( 
                '/(?:^|\s)(:\))(?:\s|$)/is',                                
                '/(?:^|\s)(:\()(?:\s|$)/is',  
                ); 

    $simple_replace = array( 
		'<strong>$1</strong>',
		'<em>$1</em>',

                ); 
    $str = preg_replace ($simple_search, $simple_replace, $str); 
    $str = bbcode_quote ($str); 
    return $str; 
}