Scripting problem

Hi,

I am having a issue with a script I have been running to populate the subject field with more information after the incident has been submitted.

What I want it to do is pull the information that the requester has put into the Subject field and then insert "Incident - CATEGORY -" in front of it (and also pull the Category from its field and insert that too.

I am using the script below on form submission but it inserts the "Incident - Category -" part twice when it submits, can you see an obvious thing wrong with the script?

var x=$CS.getValue("SUBJECT")

var y=$CS.getText("CATEGORY")

$CS.setValue("SUBJECT" ,"Incident-" + y + "-" + x)

(submit) Send