Copy filename to "Creator Job Title"

Hi all

I stumbled across this script from Paul Riggott. It copies the file name to the Title field. Tested it and it works like a charm. So far so good.

1. #target bridge    
2.    if( BridgeTalk.appName == "bridge" ) {   
3. FT = MenuElement.create("command", "Add FileName to Title", "at the end of Tools"); 
4. } 
5. FT.onSelect = function () {  
6.    AddFilenameToTitle(); 
7.    } 
8. function AddFilenameToTitle(){ 
9. var thumbs = app.document.selections;  
10. if(!thumbs.length) return; 
11. if (ExternalObject.AdobeXMPScript == undefined)  ExternalObject.AdobeXMPScript = new ExternalObject("lib:AdobeXMPScript"); 
12. for(var a in thumbs){ 
13. var selectedFile = thumbs.spec;     
14. var Title = decodeURI(selectedFile.name).replace(/\.[^\.]+$/, '') 
15.       var myXmpFile = new XMPFile( selectedFile.fsName, XMPConst.UNKNOWN, XMPConst.OPEN_FOR_UPDATE);  
16.   var myXmp = myXmpFile.getXMP(); 
17.         myXmp.deleteProperty(XMPConst.NS_DC, "title"); 
18.         myXmp.appendArrayItem(XMPConst.NS_DC, "title", Title, 0, XMPConst.ALIAS_TO_ALT_TEXT); 
19.         myXmp.setQualifier(XMPConst.NS_DC, "title[1]", "http://www.w3.org/XML/1998/namespace", "lang", "x-default"); 
20.         if (myXmpFile.canPutXMP(myXmp)) {  
21.         myXmpFile.putXMP(myXmp); 
22.          myXmpFile.closeFile(XMPConst.CLOSE_UPDATE_SAFELY);  
23.          }  
24.     } 
25. } 

I need the filename to be inserted into the "Creator: Job Title" field. I haven't written a line of code in my life, but I tried to replace all instances of "title" (case sensitive) with "photoshop:AuthorsPosition"... Should have known it didn't work.

Any help would be greatly appreciated!

Kind regards

/Henrik