onfocus og tabindex

<input type="text" name="1" id="text1" onblur="document.getElementById('text3').focus();">
<input type="text" name="2" id="text2">
<input type="text" name="3" id="text3">

<input type="text" name="1" id="text1" onblur="jump('text3');">
<input type="text" name="2" id="text2">
<input type="text" name="3" id="text3">

<script type="text/javascript">
function jump(strElm){
   document.getElementById(strElm).focus();
}
</script>