P.S. Here is the code from
http://www.shiningstar.net/articles/articles/javascript/checkboxes.asp?ID=AW
<SCRIPT LANGUAGE="JavaScript">
<!--
// by Nannette Thacker
// http://www.shiningstar.net
// This script checks and unchecks boxes on a form
// Checks and unchecks unlimited number in the group...
// Pass the Checkbox group name...
// call buttons as so:
// <input type=button name="CheckAll" value="Check All"
//onClick="checkAll(document.myform.list)">
// <input type=button name="UnCheckAll" value="Uncheck All"
//onClick="uncheckAll(document.myform.list)">
// -->
<!-- Begin
function checkAll(field)
{
for (i = 0; i < field.length; i++)
field[i].checked = true ;
}
function uncheckAll(field)
{
for (i = 0; i < field.length; i++)
field[i].checked = false ;
}
// End -->
</script>
Here is the HTML:
<form name="myform" action="checkboxes.asp" method="post">
<b>Your Favorite Scripts & Languages</b><br>
<input type="checkbox" name="list" value="1">Java<br>
<input type="checkbox" name="list" value="2">Javascript<br>
<input type="checkbox" name="list" value="3">Active Server Pages<br>
<input type="checkbox" name="list" value="4">HTML<br>
<input type="checkbox" name="list" value="5">SQL<br>
<input type="button" name="CheckAll" value="Check All"
onClick="checkAll(document.myform.list)">
<input type="button" name="UnCheckAll" value="Uncheck All"
onClick="uncheckAll(document.myform.list)">
<br>
</form>
[snip]
Only tested under IE5.5.
<html>
<head>
<title>checkboxes.htm</title>
<script type="text/vbscript">
Sub checkAll(field)
For i = 0 To field.length - 1
field(i).checked = true
Next
End Sub
Sub uncheckAll(field)
For i = 0 To field.length - 1
field(i).checked = false
Next
End Sub
</script>
</head>
<body>
<form name="myform" action="checkboxes.asp" method="post">
<b>Your Favorite Scripts & Languages</b>
<br><input type="checkbox" name="list" value="1">Java
<br><input type="checkbox" name="list" value="2">Javascript
<br><input type="checkbox" name="list" value="3">ASP
<br><input type="checkbox" name="list" value="4">HTML
<br><input type="checkbox" name="list" value="5">SQL
<br>
<input type="button" name="CheckAll" value="Check All"
onClick="checkAll(document.myform.list)">
<input type="button" name="UnCheckAll" value="Uncheck All"
onClick="uncheckAll(document.myform.list)">
</form>
</body>
</html>