script to rename files that have similar names?

Could you give this a test please Greg...

#target bridge   
if( BridgeTalk.appName == "bridge" ) {  
var newMenuData = new MenuElement( "menu", "Add_Metadata", "after Help", "myMetaData" );
var newDataCommand = new MenuElement( "command", "Rename and Add Metadata", "at the end of myMetaData" , "zxcv" );
}
newDataCommand.onSelect = function () { 
   renamePutXMP();
   }
function renamePutXMP(){
var win = new Window('dialog','Rename and Add Metadata');
g = win.graphics;
var myBrush = g.newBrush(g.BrushType.SOLID_COLOR, [0.99, 0.99, 0.99, 1]);
g.backgroundColor = myBrush;
win.alignChildren="row";
win.g10 = win.add('group');
win.g10.orientation = "row";
win.title = win.g10.add('statictext',undefined,'Rename / Add Metadata');
win.title.helpTip="Compliments of Paul";
win.title.alignment="bottom";
var g = win.title.graphics;
g.font = ScriptUI.newFont("Georgia","BOLDITALIC",22);
win.p1= win.add("panel", undefined, undefined, {borderStyle:"black"}); 
win.p1.alignChildren="fill";
win.g5 =win.p1.add('group');
win.g5.spacing=10;
win.g5.st1 = win.g5.add('statictext',undefined,'Raw Files');
win.g5.st1.preferredSize=[100,20];
win.g5.et1 = win.g5.add('edittext');
win.g5.et1.preferredSize=[250,20];
win.g5.et1.enabled=false;
win.g5.bu1 = win.g5.add('button',undefined,'Browse');
win.g10 =win.p1.add('group');
win.g10.spacing=10;
win.g10.st1 = win.g10.add('statictext',undefined,'Derivative Images');
win.g10.st1.preferredSize=[100,20];
win.g10.et1 = win.g10.add('edittext');
win.g10.et1.preferredSize=[250,20];
win.g10.et1.enabled=false;
win.g10.bu1 = win.g10.add('button',undefined,'Browse');
win.g15 =win.p1.add('group');
win.g15.orientation='row';
win.g15.alignment="top";
win.g15.spacing=10;
win.g15.bu1 = win.g15.add('button',undefined,'Process');
win.g15.bu1.preferredSize=[200,30];
win.g15.bu2 = win.g15.add('button',undefined,'Cancel');
win.g15.bu2.preferredSize=[200,30];
win.g5.bu1.onClick=function(){
     rawFolder = Folder.selectDialog("Please select the raw files folder",app.document.presentationPath);
     if(rawFolder !=null){
  win.g5.et1.text =  decodeURI(rawFolder.fsName); 
  }
}
win.g10.bu1.onClick=function(){
     derivativeFolder = Folder.selectDialog("Please select the derivative files folder",app.document.presentationPath);
     if(derivativeFolder !=null){
  win.g10.et1.text =  decodeURI(derivativeFolder.fsName); 
  }
}
win.g15.bu1.onClick=function(){
    if(win.g5.et1.text == ''){
        alert("No Raw folder selected!");
        return;
        }
    if(win.g10.et1.text == ''){
        alert("No Derivative folder selected!");
        return;
        }
    win.close(1);
    process(rawFolder,derivativeFolder);
}
win.center();
win.show();
}
function process(rawFolder,derivativeFolder){
var rawFiles = rawFolder.getFiles (/\.(cr2|crw)$/i);
if(!rawFiles.length){alert("There are no raw files to be processed!"); return;}
var derivativeFiles=derivativeFolder.getFiles (/\.(jpg|tif|psd)$/i);
if(!derivativeFiles.length){alert("There are no derivative files to be processed!"); return;}
derivativeFiles=[];
for (var a in rawFiles){
var Name = decodeURI(rawFiles.name).replace(/\.[^\.]+$/, '');
var fileMask = Name.match(/\d\d\d\d$/)+".*";
var destFiles = derivativeFolder.getFiles(fileMask);
for(var z in destFiles){
var Ext = decodeURI(destFiles.name).replace(/^.*\./,''); 
   destFiles.rename(Name+"."+Ext);
    }
}
$.sleep(300);
for (var a in rawFiles){
var Name = decodeURI(rawFiles.name).replace(/\.[^\.]+$/, '');
fileMask = Name + ".*";
destFiles = derivativeFolder.getFiles(fileMask);
for(var z in destFiles){
    if(decodeURI(destFiles.name).match(/thm$/i)) continue;
 updateMetaData(rawFiles,destFiles)
    }
}
function updateMetaData(sourceFile,destFile){
if (ExternalObject.AdobeXMPScript == undefined)  ExternalObject.AdobeXMPScript = new ExternalObject("lib:AdobeXMPScript");
sourceFile = new Thumbnail(File(sourceFile));
destFile = new Thumbnail(File(destFile));
var md = sourceFile.synchronousMetadata;
var source = new XMPMeta( md.serialize() );
var md2 = destFile.synchronousMetadata;
var dest = new XMPMeta( md2.serialize() );
try{
copySchema( source, dest,XMPConst.NS_CAMERA_RAW,["RawFileName"]);  
copySchema( source, dest,XMPConst.NS_EXIF,["PixelXDimension","PixelYDimension","ExposureTime","FNumber"]);
copySchema( source, dest,XMPConst.NS_DC,[]);
copySchema( source, dest,XMPConst.NS_XMP_RIGHTS,[]);
copySchema( source, dest,XMPConst.NS_IPTC_CORE,[]);
var updatedPacket = dest.serialize(XMPConst.SERIALIZE_OMIT_PACKET_WRAPPER | XMPConst.SERIALIZE_USE_COMPACT_FORMAT);
destFile.metadata = new Metadata(updatedPacket);
app.document.refresh();
}catch(e){alert(e+" "+e.line);}
    }
}
function copySchema( source, dest, namespace, omitProps ) {  
 var propIter = source.iterator(XMPConst.ITERATOR_JUST_CHILDREN | XMPConst.ITERATOR_JUST_LEAF_NAME, namespace, "" );
 var prop = propIter.next();
 var prefix = XMPMeta.getNamespacePrefix( namespace );
 while(prop) {      
  var name = prop.path.substring( prefix.length );     
   if(omitProps != undefined) var copy = !contains( omitProps, name);
  if( copy ) {
            try{
   XMPUtils.duplicateSubtree( source, dest, namespace, prop.path,namespace, prop.path, 0 );        
            }catch(e){}
  }
  prop = propIter.next();
 }         
}
function contains( arr, member ){
 var r = false;
 for( var i = 0; i < arr.length &! r; ++i  ) {
  r = arr == member;
 }
 return r;
}