I get an error message "undefined" for the following script..

any help?

thanks

VB Code:
  1. <html><head>

  2. <script>

  3. var h=0;

  4. function yaz()

  5. {

  6. for(h=0;h<=6;h++)

  7. {

  8. var rno=(Math.floor(Math.random()*50)+1);

  9. document.getElementById('oda').innerHTML=rno[h];

  10. }

  11. }

  12. </script></head><body>

  13. <div id="oda">......</div>

  14. <form>

  15. <input type=button value="print the rand nums" onClick="yaz()">

  16. </form></body></html>