Script to add keywords in Bridge based on the filename

I must have done something wrong as the script doesn't appear to be actually adding any keywords. It isn't giving me any errors either. I added a JavaScript alert to check if the AppleScript variables are successfully being passed to the JavaScript. The alert displays the different keywords I want to add successfully, so that part works. I'm guessing I need to fix the JavaScript at the bottom of the script (inside the handler).  If anyone could help me figure out how to fix that part, I'd greatly appreciate it!

on open of droppedfiles

    with timeout of 900 seconds -->Changing timeout to 15 minutes. Default is 2 minutes.

        -------------------------------------------------------------

        --GETTING THE CHARACTERS OF THE FILENAME

        -------------------------------------------------------------

        repeat with afile in droppedfiles

            tell application "Finder"

                set fileName to name of afile

            end tell

            -------------------------------------------------------------

            -------------------------------------------------------------

            -------------------------------------------------------------

            --ADDING A KEYWORD FOR EACH PREFIX

            -------------------------------------------------------------

            --Finding the prefix in the filename

            if text 1 thru 2 of fileName contains "AG" then

                set prefixKeyword to "Agriculture"

            else if text 1 thru 2 of fileName contains "AU" then

                set prefixKeyword to "Automotive"

            else if text 1 thru 2 of fileName contains "BI" then

                set prefixKeyword to "Bicycle"

            else if text 1 thru 2 of fileName contains "SG" then

                set prefixKeyword to "Sporting Goods"

            else if text 1 thru 2 of fileName contains "TY" then

                set prefixKeyword to "Toy"

            else

                set prefixKeyword to "Need prefix"

            end if

            --Calling the addKeyword handler at the bottom of the script to add the prefix as a keyword

            my addKeyword(afile, prefixKeyword)

            -------------------------------------------------------------

            -------------------------------------------------------------

            -------------------------------------------------------------

            --ADDING A KEYWORD FOR EACH SKU NUMBER

            -------------------------------------------------------------

            --Creating a list of all single digit numbers

            set numberList to {"0", "1", "2", "3", "4", "5", "6", "7", "8", "9"}

            --CHECKING FOR THE SKU NUMBER

            --Checking for a six digit number that starts on the third character of the filename

            if numberList contains (text 3 of fileName) and numberList contains (text 4 of fileName) and numberList contains (text 5 of fileName) and numberList contains (text 6 of fileName) and numberList contains (text 7 of fileName) then

                if numberList does not contain text 9 of fileName then

                    if numberList contains (text 8 of fileName) then

                        set skuNumber to text 3 thru 8 of fileName

                        set skuNumberOffset to 8

                    end if

                end if

                --Checking for a six digit number that starts on the fourth character of the filename

            else if numberList contains (text 4 of fileName) and numberList contains (text 5 of fileName) and numberList contains (text 6 of fileName) and numberList contains (text 7 of fileName) and numberList contains (text 8 of fileName) then

                if numberList does not contain text 10 of fileName then

                    if numberList contains (text 9 of fileName) then

                        set skuNumber to text 4 thru 9 of fileName

                        set skuNumberOffset to 9

                    end if

                end if

                --Setting the SKU Number Keyword to a warning keyword the user can search for if no SKU number is found   

            else

                set skuNumber to "Need SKU Number"

                set skuNumberOffset to 0

            end if

            --Calling the addKeyword handler at the bottom of the script to add the SKU number as a keyword

            my addKeyword(afile, skuNumber)

            -------------------------------------------------------------

            -------------------------------------------------------------

            -------------------------------------------------------------

            --ADDING DATE FROM FILENAME

            -------------------------------------------------------------

            if fileName contains "(" and fileName contains ")" then

                set leftParen to "("

                set rightParen to ")"

                --Getting the month from the filename

                set monthOffset to (offset of leftParen in fileName) + 1 -->returns character right after (

                set fileNameMonth to character monthOffset of fileName

                --Getting all digits of the year from the filename

                set fileNameYearOffset1 to (offset of leftParen in fileName) + 3

                set fileNameYearOffset2 to (offset of rightParen in fileName) - 1

                set fileNameYear1 to character fileNameYearOffset1 of fileName

                set fileNameYear2 to character fileNameYearOffset2 of fileName

                set fileNameYear to characters fileNameYearOffset1 thru fileNameYearOffset2 of fileName

                set dateKeyword to fileNameMonth & "/" & fileNameYear

                --Calling the addKeyword handler at the bottom of the script to add the date as a keyword

                my addKeyword(afile, dateKeyword)

            end if

        end repeat

    end timeout

end open

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--HANDLER TO ADD KEYWORDS

on addKeyword(myFile, myKeyword)

    tell application "Adobe Bridge CS6"

        activate

        do javascript "

var Keys = '" & myKeyword & "';

var file = '" & myFile & "'; 

if(file.exists) setKeyword(file, Keys);

function setKeyword(Keys){ 

if ( !ExternalObject.AdobeXMPScript ) ExternalObject.AdobeXMPScript = new ExternalObject('lib:AdobeXMPScript'); 

        var xmpf = new XMPFile( File(file).fsName, XMPConst.UNKNOWN, XMPConst.OPEN_FOR_UPDATE ); 

        var xmp = xmpf.getXMP(); 

        for(var s in Keys){ 

        xmp.appendArrayItem(XMPConst.NS_DC, 'subject', Keys, 0,XMPConst.PROP_IS_ARRAY); 

    } 

      if (xmpf.canPutXMP( xmp )) { 

         xmpf.putXMP( xmp ); 

      } 

      xmpf.closeFile( XMPConst.CLOSE_UPDATE_SAFELY ); 

}; 

//Displaying an alert to check if it's passing in the AppleScript variables

        alert(Keys);

  /**/"

    end tell

end addKeyword