update drag and drop error in Firefox

vcm/js/DragnDrop.js

 var startend = ""
 
+// function preload(arrayOfImages) {
+//   $(arrayOfImages).each(function(){
+//       $('<img/>')[0].src = this;
+//       // Alternatively you could use:
+//       // (new Image()).src = this;
+//   });
+// }
+
+// // Usage:
+
+// preload([
+//   '../datasource-data/NoiseData/Icons_soundquiz/s_noise_spacecadet.png',
+//   '../datasource-data/NoiseData/Icons_soundquiz/s_noise_paologreen.png',
+//   '../datasource-data/NoiseData/Icons_soundquiz/s_noise_rosybrown.png'
+// ]);
+
+
+
+
+
+
+
 function dragstart_handler(e){
     var img = new Image();
     img.src = '../templates/locationSMsmall.png';
-    e.dataTransfer.setDragImage(img, 23, 45);    
+
+    e.dataTransfer.setDragImage(img, 11, 24);    
     // e.dataTransfer.setDragImage(img, 75, 145); 
 }
 function dragstart_handler_quiz1(e){
-  var img = new Image();
-  img.src = '../datasource-data/NoiseData/Icons_soundquiz/s_noise_spacecadet.png';
-  e.dataTransfer.setDragImage(img, 23, 45);    
+  // var img = new Image();
+  // img.src = '../datasource-data/NoiseData/Icons_soundquiz/s_noise_spacecadet.png';
+  // e.dataTransfer.setDragImage(img, 23, 45);    
   // e.dataTransfer.setDragImage(img, 75, 145); 
 }
 function dragstart_handler_quiz2(e){
-  var img = new Image();
-  img.src = '../datasource-data/NoiseData/Icons_soundquiz/s_noise_paologreen.png';
-  e.dataTransfer.setDragImage(img, 23, 45);    
+  // var img = new Image();
+  // img.src = '../datasource-data/NoiseData/Icons_soundquiz/s_noise_paologreen.png';
+  // e.dataTransfer.setDragImage(img, 23, 45);    
   // e.dataTransfer.setDragImage(img, 75, 145); 
 }
 function dragstart_handler_quiz3(e){
-  var img = new Image();
-  img.src = '../datasource-data/NoiseData/Icons_soundquiz/s_noise_rosybrown.png';
-  e.dataTransfer.setDragImage(img, 23, 45);    
+  // var img = new Image();
+  // img.src = '../datasource-data/NoiseData/Icons_soundquiz/s_noise_rosybrown.png';
+  // e.dataTransfer.setDragImage(img, 23, 45);    
   // e.dataTransfer.setDragImage(img, 75, 145); 
 }
 function dragstart_handler_quiz4(e){
-  var img = new Image();
-  img.src = '../datasource-data/NoiseData/Icons_soundquiz/s_noise_rosevale.png';
-  e.dataTransfer.setDragImage(img, 23, 45);    
+  // var img = new Image();
+  // img.src = '../datasource-data/NoiseData/Icons_soundquiz/s_noise_rosevale.png';
+  // e.dataTransfer.setDragImage(img, 23, 45);    
   // e.dataTransfer.setDragImage(img, 75, 145); 
 }
 function dragstart_handler_quiz5(e){
-  var img = new Image();
-  img.src = '../datasource-data/NoiseData/Icons_soundquiz/s_noise_myrtlegreen.png';
-  e.dataTransfer.setDragImage(img, 23, 45);    
+  // var img = new Image();
+  // img.src = '../datasource-data/NoiseData/Icons_soundquiz/s_noise_myrtlegreen.png';
+  // e.dataTransfer.setDragImage(img, 23, 45);    
   // e.dataTransfer.setDragImage(img, 75, 145); 
 }
 function dragstart_handler_quiz6(e){
-  var img = new Image();
-  img.src = '../datasource-data/NoiseData/Icons_soundquiz/s_noise_babyblue.png';
-  e.dataTransfer.setDragImage(img, 23, 45);    
+  // var img = new Image();
+  // img.src = '../datasource-data/NoiseData/Icons_soundquiz/s_noise_babyblue.png';
+  // e.dataTransfer.setDragImage(img, 23, 45);    
   // e.dataTransfer.setDragImage(img, 75, 145); 
 }
 function dragstart_handler_quiz7(e){
-  var img = new Image();
-  img.src = '../datasource-data/NoiseData/Icons_soundquiz/s_noise_rubyred.png';
-  e.dataTransfer.setDragImage(img, 23, 45);    
+  // var img = new Image();
+  // img.src = '../datasource-data/NoiseData/Icons_soundquiz/s_noise_rubyred.png';
+  // e.dataTransfer.setDragImage(img, 23, 45);    
   // e.dataTransfer.setDragImage(img, 75, 145); 
 }
 function dragstart_handler_quiz8(e){
-  var img = new Image();
-  img.src = '../datasource-data/NoiseData/Icons_soundquiz/s_noise_greensheen.png';
-  e.dataTransfer.setDragImage(img, 23, 45);    
+  // var img = new Image();
+  // img.src = '../datasource-data/NoiseData/Icons_soundquiz/s_noise_greensheen.png';
+  // e.dataTransfer.setDragImage(img, 23, 45);    
   // e.dataTransfer.setDragImage(img, 75, 145); 
 }
 
@@ -76,6 +99,10 @@ function dragDrop(e) {
   var viewer = map.getCesiumWidget()
   var scene = map.getCesiumWidget()._scene
 
+  // stop Firefox from executing its default behaviour
+  if(e.preventDefault) { e.preventDefault(); }
+    if(e.stopPropagation) { e.stopPropagation(); }
+
 // var scene = viewer.scene;
 // var billboards = scene.primitives.add(new Cesium.BillboardCollection());
 
@@ -272,4 +299,7 @@ var billboards = scene.primitives.add(new Cesium.BillboardCollection());
 
 function setPointStartEnd(loc){
 startend = loc
-}
\ No newline at end of file
+}
+
+
+