form.elements[i] in MSIE

  Hiya.  The following snippet of code validates the
  quantity fields on an order form.
  I don't know how many fields may be on this page,
  so I'm using a while loop rather than a for loop
  to loop through the form elements.
  This is fine using Netscape.  Elements that do not
  exist return a null.
  Using MSIE 3.0, however, I get a jscript error.
  (Scripting error: Unknown name.)
  Can anyone suggest a method of looping through an
  unknown number of form elements (specifically
  text fields) that works in MSIE?
  James Honaker
  // validates form data
  function Validate(form) {
    var i=0;
    while (form.elements[i]) {
      if (form.elements[i].name=="quantity") {
        var element=form.elements[i];
        var value=element.value;
        if (IsEmpty(value) || !IsPosInteger(value)){
          var msg="Please enter a quantity from 0 to 999.\n\n";
          msg+="Enter 0 to remove this item from your order.";
          return false;
    return true;
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Base the 'for' loop test on


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