function MoveTab(txtObj, event) {
 var keyCode = event.keyCode ? event.keyCode : event.which ? event.which : event.charCode;
    if (keyCode == 13) {
     var i;
        for (i = 0; i < txtObj.form.elements.length; i++)
         if (txtObj == txtObj.form.elements[i])
             break;
            i = (i + 1) % txtObj.form.elements.length;
            txtObj.form.elements[i].focus();
            return false;
        }
    else
     return true;
}

적용

<input type="text' name="text1" onkeypress="return MoveTab(this, event)">