diff --git a/README.md b/README.md
index 3894334..bb3a7f6 100644
--- a/README.md
+++ b/README.md
@@ -112,7 +112,7 @@ The native types are `String`, `Number`, `Boolean`, `Date` and `null`. You can a
 arrays and subdocuments (objects). If a field is `undefined`, it will not be saved (this is different from 
 MongoDB which transforms `undefined` in `null`, something I find counter-intuitive).  
 
-An `_id` field will be automatically generated by NeDB. It's a 16-characters alphanumerical string that cannot be modified once it has been generated. Unlike with MongoDB, you cannot specify it (that shouldn't be a problem anyway).
+If the document does not contain an `_id` field, NeDB will automatically generated one for you (a 16-characters alphanumerical string). The `_id` of a document, once set, cannot be modified.
 
 Field names cannot begin by '$' or contain a '.'.
 
diff --git a/browser-version/out/nedb.js b/browser-version/out/nedb.js
index e0e6c5c..8d3e66c 100644
--- a/browser-version/out/nedb.js
+++ b/browser-version/out/nedb.js
@@ -561,7 +561,8 @@ process.nextTick = (function () {
     if (canPost) {
         var queue = [];
         window.addEventListener('message', function (ev) {
-            if (ev.source === window && ev.data === 'process-tick') {
+            var source = ev.source;
+            if ((source === window || source === null) && ev.data === 'process-tick') {
                 ev.stopPropagation();
                 if (queue.length > 0) {
                     var fn = queue.shift();
@@ -683,13 +684,23 @@ Cursor.prototype._exec = function(callback) {
   if (this._sort) {
     keys = Object.keys(this._sort);
     
-    // Going backwards so that the first sort is the last that gets applied
-    for (i = keys.length - 1; i >= 0; i -= 1) {
+    // Sorting
+    var criteria = [];
+    for (i = 0; i < keys.length; i++) {
       key = keys[i];
-      res.sort(function(a, b) {
-        return self._sort[key] * model.compareThings(model.getDotValue(a, key), model.getDotValue(b, key));
-      });    
+      criteria.push({ key: key, direction: self._sort[key] });
     }
+    res.sort(function(a, b) {
+      var criterion, compare, i;
+      for (i = 0; i < criteria.length; i++) {
+        criterion = criteria[i];
+        compare = criterion.direction * model.compareThings(model.getDotValue(a, criterion.key), model.getDotValue(b, criterion.key));
+        if (compare !== 0) {
+          return compare;
+        }
+      }
+      return 0;
+    });
     
     // Applying limit and skip
     var limit = this._limit || res.length
@@ -1096,7 +1107,7 @@ Datastore.prototype.prepareDocumentForInsertion = function (newDoc) {
     preparedDoc = [];
     newDoc.forEach(function (doc) { preparedDoc.push(self.prepareDocumentForInsertion(doc)); });
   } else {
-    newDoc._id = customUtils.uid(16);
+    newDoc._id = newDoc._id || customUtils.uid(16);
     preparedDoc = model.deepCopy(newDoc);
     model.checkObject(preparedDoc);
   }
diff --git a/browser-version/out/nedb.min.js b/browser-version/out/nedb.min.js
index d825371..8c082b3 100644
--- a/browser-version/out/nedb.min.js
+++ b/browser-version/out/nedb.min.js
@@ -1,2 +1,2 @@
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this.hasOwnProperty("key")?(e=e||this.getLowerBoundMatcher(t),n=n||this.getUpperBoundMatcher(t),e(this.key)&&this.left&&r(i,this.left.betweenBounds(t,e,n)),e(this.key)&&n(this.key)&&r(i,this.data),n(this.key)&&this.right&&r(i,this.right.betweenBounds(t,e,n)),i):[]},n.prototype.deleteIfLeaf=function(){return this.left||this.right?!1:this.parent?(this.parent.left===this?this.parent.left=null:this.parent.right=null,!0):(delete this.key,this.data=[],!0)},n.prototype.deleteIfOnlyOneChild=function(){var t;return this.left&&!this.right&&(t=this.left),!this.left&&this.right&&(t=this.right),t?this.parent?(this.parent.left===this?(this.parent.left=t,t.parent=this.parent):(this.parent.right=t,t.parent=this.parent),!0):(this.key=t.key,this.data=t.data,this.left=null,t.left&&(this.left=t.left,t.left.parent=this),this.right=null,t.right&&(this.right=t.right,t.right.parent=this),!0):!1},n.prototype.delete=function(t,e){var n,r=[],i=this;if(this.hasOwnProperty("key")){if(this.compareKeys(t,this.key)<0)return this.left&&this.left.delete(t,e),void 0;if(this.compareKeys(t,this.key)>0)return this.right&&this.right.delete(t,e),void 0;if(0!==!this.compareKeys(t,this.key))return this.data.length>1&&e?(this.data.forEach(function(t){i.checkValueEquality(t,e)||r.push(t)}),i.data=r,void 0):(this.deleteIfLeaf()||this.deleteIfOnlyOneChild()||(Math.random()>=.5?(n=this.left.getMaxKeyDescendant(),this.key=n.key,this.data=n.data,this===n.parent?(this.left=n.left,n.left&&(n.left.parent=n.parent)):(n.parent.right=n.left,n.left&&(n.left.parent=n.parent))):(n=this.right.getMinKeyDescendant(),this.key=n.key,this.data=n.data,this===n.parent?(this.right=n.right,n.right&&(n.right.parent=n.parent)):(n.parent.left=n.right,n.right&&(n.right.parent=n.parent)))),void 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diff --git a/lib/datastore.js b/lib/datastore.js
index 1296265..4592316 100644
--- a/lib/datastore.js
+++ b/lib/datastore.js
@@ -300,7 +300,7 @@ Datastore.prototype.prepareDocumentForInsertion = function (newDoc) {
     preparedDoc = [];
     newDoc.forEach(function (doc) { preparedDoc.push(self.prepareDocumentForInsertion(doc)); });
   } else {
-    newDoc._id = customUtils.uid(16);
+    newDoc._id = newDoc._id || customUtils.uid(16);
     preparedDoc = model.deepCopy(newDoc);
     model.checkObject(preparedDoc);
   }
diff --git a/test/db.test.js b/test/db.test.js
index 658daef..572a9b3 100644
--- a/test/db.test.js
+++ b/test/db.test.js
@@ -198,12 +198,12 @@ describe('Database', function () {
       });
     });
 
-    it('If an _id is already given when we insert a document, dont use it but use an automatic one', function (done) {
+    it('If an _id is already given when we insert a document, use that instead of generating a random one', function (done) {
       d.insert({ _id: 'test', stuff: true }, function (err, newDoc) {
         if (err) { return done(err); }
 
         newDoc.stuff.should.equal(true);
-        newDoc._id.should.not.equal('test');
+        newDoc._id.should.equal('test');
 
         done();
       });