diff --git a/source/import/importer.js b/source/import/importer.js
index b6647a7..0906e2f 100644
--- a/source/import/importer.js
+++ b/source/import/importer.js
@@ -179,6 +179,21 @@ OV.FileList = class
 	}
 };
 
+OV.RevokeModelUrls = function (model)
+{
+	if (model === null) {
+		return;
+	}
+	for (let i = 0; i < model.MaterialCount (); i++) {
+		let material = model.GetMaterial (i);
+		material.EnumerateTextureMaps (function (texture) {
+			if (texture.url !== null) {
+				OV.RevokeObjectUrl (texture.url);
+			}
+		});
+	}
+}
+
 OV.ImportErrorCode =
 {
 	NoImportableFile : 1,
@@ -280,21 +295,6 @@ OV.Importer = class
 		callbacks.success (result);
 	}
 
-	RevokeReferences (model)
-	{
-		if (model === null) {
-			return;
-		}
-		for (let i = 0; i < model.MaterialCount (); i++) {
-			let material = model.GetMaterial (i);
-			material.EnumerateTextureMaps (function (texture) {
-				if (texture.url !== null) {
-					OV.RevokeObjectUrl (texture.url);
-				}
-			});
-		}
-	}		
-
 	LoadFiles (fileList, fileSource, onReady)
 	{
 		let newFileList = new OV.FileList (this.importers);
diff --git a/website/o3dv/dialogs.js b/website/o3dv/dialogs.js
index 935d8fd..336b05f 100644
--- a/website/o3dv/dialogs.js
+++ b/website/o3dv/dialogs.js
@@ -65,6 +65,11 @@ OV.ButtonDialog = class
         return dialogContentDiv;
     }
 
+    SetCloseHandler (closeHandler)
+    {
+        this.modal.SetCloseHandler (closeHandler);
+    }
+
     Show ()
     {
         this.modal.Open ();
@@ -241,6 +246,7 @@ OV.ShowExportDialog = function (model)
     let fileListSection = $('<div>').addClass ('ov_dialog_section').appendTo (contentDiv);
     let fileList = $('<div>').addClass ('ov_dialog_file_list').addClass ('ov_thin_scrollbar').appendTo (fileListSection);
 
+    let createdUrls = [];
     formatSelect.change (function () {
         fileList.empty ();
         let selectedIndex = formatSelect.prop ('selectedIndex');
@@ -260,8 +266,8 @@ OV.ShowExportDialog = function (model)
                     let file = files[i];
                     let url = file.GetUrl ();
                     if (url === null) {
-                        // TODO: revoke on close
                         url = OV.CreateObjectUrl (file.GetContent ());
+                        createdUrls.push (url);
                     }
                     let fileLink = $('<a>').addClass ('ov_dialog_file_link').appendTo (fileList);
                     fileLink.attr ('href', url);
@@ -274,6 +280,11 @@ OV.ShowExportDialog = function (model)
 		});
     });
 
+    dialog.SetCloseHandler (function () {
+        for (let i = 0; i < createdUrls.length; i++) {
+            OV.RevokeObjectUrl (createdUrls[i]);
+        }
+    });
     dialog.Show ();
     return dialog;
 };
diff --git a/website/o3dv/modal.js b/website/o3dv/modal.js
index 048232b..f1b53e1 100644
--- a/website/o3dv/modal.js
+++ b/website/o3dv/modal.js
@@ -6,6 +6,7 @@ OV.Modal = class
         this.overlayDiv = null;
         this.resizeHandler = null;
         this.customResizeHandler = null;
+        this.closeHandler = null;
         this.isOpen = false;
         this.closeable = true;
     }
@@ -25,6 +26,11 @@ OV.Modal = class
         this.customResizeHandler = customResizeHandler;
     }
 
+    SetCloseHandler (closeHandler)
+    {
+        this.closeHandler = closeHandler;
+    }
+
     Open ()
     {
         let windowObj = $(window);
@@ -54,6 +60,9 @@ OV.Modal = class
 
         let windowObj = $(window);
         windowObj.unbind ('resize', this.resizeHandler);
+        if (this.closeHandler !== null) {
+            this.closeHandler ();
+        }
 
         this.modalDiv.remove ();
         this.overlayDiv.remove ();
diff --git a/website/o3dv/website.js b/website/o3dv/website.js
index 74afeac..38f8462 100644
--- a/website/o3dv/website.js
+++ b/website/o3dv/website.js
@@ -72,8 +72,7 @@ OV.Website = class
             this.dialog = null;
 		}
 		if (this.model !== null) {
-			let importer = this.modelLoader.GetImporter ();
-			importer.RevokeReferences (this.model);
+			OV.RevokeModelUrls (this.model);
 		}
 		this.model = null;
 		this.parameters.introDiv.hide ();