Check for scrollbar visibility and load jScrollPane if scrollbars are visible

gistfile1.js

//This example requires YepNope or Modernizr.load (which are the same) and jQuery

var customScroll = (function () {
	var customScroll = {};
	
	customScroll.selector = ".entry-gallery, .entry-main";
	
	customScroll.init = function () {
		try {
			(yepnope || Modernizr.load)({
				test: customScroll.hasScrollBars,
				yep: 'res/jscrollpane.js',
				callback: customScroll.set
			});
		} catch (e) {}
	}
	
	customScroll.set = function () {
		$(function () {
			$(customScroll.selector).jScrollPane({
				animateScroll: true
			});
		});
	}
	
	customScroll.hasScrollBars = (function () {
		var d = document,
		    body = d.body,
		    css = 'width: 100px; height: 100px; overflow: scroll; position: absolute; top: -9999px;',
		    div = d.createElement("div");
		
		div.setAttribute('style', css);
		body.appendChild(div);
		
		var scrollbarWidth = div.offsetWidth - div.clientWidth;
		body.removeChild(div);
		
		return scrollbarWidth > 1;
	}());
	
	customScroll.init();
	
	return customScroll;
})();