onClick check all checkboxes

How do I onclick of button, check all checkboxes on a form. (FYI form Name = sched)?
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sybeConnect With a Mentor Commented:
The code below works in NS3, haven't checked it with other browsers. You can't do it with a submit button, because this will submit the form. But in stead of the text between the <a href=...> and </a> you can use an image which looks like a button.

You can build in a check if a form element is a checkbox or not.
something like:
if (document.form1.element[i].type = "checkbox") {



function CheckThem() {
      i = 0;
      while (i < document.form1.length) {
            document.form1.elements[i].checked = true;
            i = i + 1


<form name="form1">
<input type="checkbox" name="a">
<input type="checkbox" name="b">
<input type="checkbox" name="c">
<input type="checkbox" name="d">
<input type="checkbox" name="e">
<input type="checkbox" name="f">
<input type="checkbox" name="g">
<input type="checkbox" name="h">
<input type="checkbox" name="i">
<a href="Javascript:CheckThem()">Check All Boxes</a>


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