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Try the following which loads the 1-3.htm page if one, two or three checkboes have been checked, the 4-6.htm page if four, five or six, and the 7-9.htm page if seven, eight or nine checkboes have been checked:
<html>
<head>
<script language="JavaScript"><!--
function redirect (form, group) {
var numberClicked = 0;
for (var i=0; i<form.elements.length; i++) {
if (form.elements[i].name == group && form.elements[i].type == 'checkbox' && form.elements[i].checked)
numberClicked++;
}
if (numberClicked <= 3) url = '1-3.htm'
else if (numberClicked <= 6) url = '4-6.htm';
else url = '7-9.htm';
location.href = url;
return false;
}
//--></script>
</head>
<body>
<form onSubmit="return redirect(this,'group1')">
<input type="checkbox" name="group1">
<input type="checkbox" name="group1">
<input type="checkbox" name="group1">
<input type="checkbox" name="group1">
<input type="checkbox" name="group1">
<input type="checkbox" name="group1">
<input type="checkbox" name="group1">
<input type="checkbox" name="group1">
<input type="checkbox" name="group1">
<input type="submit" value="Submit">
</form>
</body>
</html>