Wanting a Javascript way of navigating/linking by user entering numbers

Problem as follows. I'm sure the solution is fairly straightforward; I'm a newcomer to Javascript:

I have 75 files which I want accessed from one menu link. Each file is referenced by a number, so for instance "OD_01_PC.htm" can be referred to as "01" as far as the user is concerned; "OD_02_CT.htm" can be referred to as "02", and so forth: The file names vary, but each is given a double digit integer reference number.

I could do it as a jump menu - however the menu would end up being too awkwardly long for the user to scroll through. What I want is a form field where the user can simply enter "63" for instance, and be taken to the corresponding file ("OD_63_PF.htm"), after clicking a "go" button.

I am not looking for the most efficient code. The validation need not be complicated: If the user enters anything other than 01-75 or 0-9 --- the field should simply be cleared on clicking "go". User entry of "9" should be treated the same as user entry of "09".

Any help would be much appreciated.

"voland"

Here you are:-

<form name = "myform">
<input type = "text" name = "inBox" size = "2" maxlength = "2">
<input type = "button" value = "GO" onclick = "jump()">
</form>

<script type = "text/javascript">

function jump() {
val = document.myform.inBox.value;
val = parseInt(val);
if (!/\d{1,2}/.test(val)) {
alert ("Invalid Entry! Only numbers are allowed!");
document.myform.inBox.value = "";
document.myform.inBox.focus();
return false;
}
if (val <1 || val >75) {
alert ("Invalid Entry! Must be in range 1 to 75");
document.myform.inBox.value = "";
document.myform.inBox.focus();
return false;
}
if (val <=9) {
val = "0" + val;
}
val = "OD_" + val +"_CT.htm";
alert (val); // delete after testing
window.location = val;
}
</script>

Our advice and assistance is packaged by intellectual weight and not by volume. The contents may possibly settle in transit. E&OE