Почему не работает такой код
<div id="yu">
   <img src="Smail/1.gif" width="20" height="24"   title="smail:-)" />
   <img src="Smail/2.gif" width="28" height="23" title="laughing out lou" />
   <img src="Smail/5.gif" width="30" height="26"  title="tank you" />
</div>
<script language="JavaScript" type="text/javascript">
      /*<![CDATA[*/
         var cont=document.getElementById('yu');
          var arr=[];
          for (var x=cont.firstChild;x!=null;x=x.nextSibling)
                 {   var y=x.getAttribute('title') ;
                    arr.push(y);}
          var kl=arr[0] ;
           alert(kl);
   /*]]>*/
   </script>