Modified the code so mouse wheel is released when the scrollbar reaches

top or bottom of the scrollable area to simulate the behaviour of
natural HTML elements such as textarea or div with overflow:auto;

Updated version number.

slimScroll.js

@@ -2,7 +2,7 @@
  * Dual licensed under the MIT (http://www.opensource.org/licenses/mit-license.php)
  * and GPL (http://www.opensource.org/licenses/gpl-license.php) licenses.
  *
- * Version: 0.4.1
+ * Version: 0.4.3
  * 
  */
 (function($) {
@@ -34,7 +34,7 @@
       // do it for every element that matches selector
       this.each(function(){
 
-      var isOverPanel, isOverBar, isDragg, queueHide, barHeight,
+      var isOverPanel, isOverBar, isDragg, queueHide, barHeight, percentScroll,
         divS = '<div></div>',
         minBarHeight = 30,
         releaseScroll = false,
@@ -182,16 +182,15 @@
             delta = parseInt(bar.css('top')) + y * wheelStep / 100 * bar.outerHeight();
 
             // move bar, make sure it doesn't go out
-            delta = Math.max(delta, 0);
             var maxTop = me.outerHeight() - bar.outerHeight();
-            delta = Math.min(delta, maxTop);
+            delta = Math.min(Math.max(delta, 0), maxTop);
 
             // scroll the scrollbar
             bar.css({ top: delta + 'px' });
           }
 
           // calculate actual scroll amount
-          var percentScroll = parseInt( bar.css('top') ) / (me.outerHeight() - bar.outerHeight());
+          percentScroll = parseInt(bar.css('top')) / (me.outerHeight() - bar.outerHeight());
           delta = percentScroll * (me[0].scrollHeight - me.outerHeight());
 
           if (isJump)
@@ -209,7 +208,6 @@
 
           // trigger hide when scroll is stopped
           hideBar();
-
         }
 
         var attachWheel = function()
@@ -243,7 +241,10 @@
           // recalculate bar height
           getBarHeight();
           clearTimeout(queueHide);
-
+
+          // release wheel when bar reached top or bottom
+          releaseScroll = percentScroll == ~~ percentScroll;
+
           // show only when required
           if(barHeight >= me.outerHeight()) {
             //allow window scroll