Mine

     function smilies($text) {
       $sm1 = array("x.x", ":S", ":\", ":-D", ">:O", ":oh:", ":(", ":)", ":o", ":whoa:", ";)", ":D");
  		 $sm2 = array("<img src='smilies/arg.gif'>", "<img src='smilies/confused.gif'>", "<img src='smilies/hu.gif'>", "<img src='smilies/laugh.gif'>", "<img src='smilies/mad.gif'>", "<img src='smilies/oh.gif'>", "<img src='smilies/sad.gif'>", "<img src='smilies/smile.gif'>", "<img src='smilies/waa.gif'>", "<img src='smilies/whoa.gif'>", "<img src='smilies/wink.gif'>", "<img src='smilies/yey.gif'>");
  		$text = str_replace($sm1, $sm2, $text);
  		return $text;
}