SL wiki server javascript

Hello!

I have a small page+javascript which I want to implement to wiki page. I have elliminated problem with html tags filtering (whitelist.plist) with disabling filtering at all. Now I face another problem. Script is not working. I have read manual which says that I should implement java as a file in template folder, but I don't really get it. Could sb explain. I would appreciate any help!

Script looks like this:

<form>

<input onclick="clickCh(this)" type="checkbox" name="one" value="10"> $10.00<br>

<input onclick="clickCh(this)" type="checkbox" name="two" value="12"> $12.00<br>

<br>

<input id="total" type="text" name="total">

</form>

<script language="JavaScript" type="text/javascript">

var total = document.getElementById("total")

function clickCh(caller){

if(caller.checked){

add(caller)

} else {

subtract(caller)

}

}

function add(caller){ total.value = total.value*1 + caller.value*1}

function subtract(caller){ total.value = total.value*1 - caller.value*1}

</script>