/* 
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
function check_trlfilename(){
      //check upload trl file name
        if( document.UploadForm.File_Trl.value.length == 0){
              alert("Please choose one PolNav's trail file!");
                   return false;
        }
        else{
               var uploadfile_name =  document.UploadForm.File_Trl.value;
               var sub_uploadfile_name = uploadfile_name.split(".");
               if(sub_uploadfile_name[1] !="trl"){
                      alert("Please upload Polnav's trail file (*.trl)");
               }
        }
        return true;
}


function check_kmlfilename(){
      //check upload trl file name
        if( document.UploadForm.File_Trl.value.length == 0){
              alert("Please choose one KML file (*.kml) !");
                   return false;
        }
        else{
               var uploadfile_name =  document.UploadForm.File_Trl.value;
               var sub_uploadfile_name = uploadfile_name.split(".");
               if(sub_uploadfile_name[1] !="kml"){
                      alert("Please upload KML file (*.kml)");
               }
        }
        return true;
}

function check_gpxfilename(){
      //check upload trl file name
        if( document.UploadForm.File_Trl.value.length == 0){
              alert("Please choose one GPX file (*.gpx) !");
                   return false;
        }
        else{
               var uploadfile_name =  document.UploadForm.File_Trl.value;
               var sub_uploadfile_name = uploadfile_name.split(".");
               if(sub_uploadfile_name[1] !="gpx"){
                      alert("Please upload GPX file (*.gpx)");
               }
        }
        return true;
}