exportIdmlOrInx.jsx

(function(){
  var docs = app.documents;
  if(docs.length===0)return;
  for(var i=0,len=docs.length;i<len;i++){
      var doc = docs[i];
      var docPath = doc.fullName.absoluteURI;
      if(parseInt(app.version) > 6){
          var idmlFile = new File(docPath.split('.')[0]+'.idml');
          doc.exportFile(ExportFormat.INDESIGN_MARKUP,idmlFile);
      }else{
          var idmlFile = new File(docPath.split('.')[0]+'.inx');
          doc.exportFile(ExportFormat.INDESIGN_INTERCHANGE,idmlFile);
      }
  };
  alert('OK');
}());