Javascript help needed (confirmation for cancel button )

Hi guys!
I am not good at javascript but am going to improve shortly :-). Now i need very quick fix.
I'm using <html:cancel> button in Struts 1.1 and I'm using without thinking the following code:
<html:cancel onclick="bCancel=true;" >
<bean:message key="cancel.operation"/>
</html:cancel>
It is not that important though. I would like very much to alert user on possible loss of data (long multipaged form - could press mistakingly, who knows).
Would you, please post the javascript code that is needed to accomplish this - just alert and if yes - cancel, no - leave alone?
I'll really appreciate this.

Thank you for your response.
I also manage to write this. Is this correct?
<script language="JavaScript">
function ensure() {
return confirm("Are you sure that you want to cancel this operation?");
</script>
<td colspan="3" align="center">
<html:cancel onclick="bCancel=ensure();" >
<bean:message key="cancel.operation"/>
</html:cancel>
</td>

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> Dooza wrote:
>> Hi there, I am not very good with Javascript, so was
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>> help.
>>
>> I have a select list for an order checkout page,
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