js/jcf.scrollable.js
function() {
				self.value += stepValue;
				self.setValue(self.value);
				self.triggerScrollEvent(self.value);

				if (isFinishedScrolling()) {
					clearInterval(self.pageScrollTimer);
				}
			}
function() {
				self.value += stepValue;
				self.setValue(self.value);
				self.triggerScrollEvent(self.value);

				if (isFinishedScrolling()) {
					clearInterval(self.pageScrollTimer);
				}
			}
function ( ) { self . value += stepValue ; self . setValue ( self . value ) ; self . triggerScrollEvent ( self . value ) ; if ( isFinishedScrolling ( ) ) { clearInterval ( self . pageScrollTimer ) ; } }
scroll by page when track is pressed
scroll by page when track is pressed