var slider_r;
var width_r;

document.observe("dom:loaded", function() {   
    try
    {
        width_r = ($('side_right').scrollHeight - $('side_right').offsetHeight);
    }
    catch(error)
    {
        width_r = 100
    }
    
    //if no width set width to 1 to avoid JS error
    if(width_r < 1)
    {
        width_r = 1
    }
    
    slider_r = new Control.Slider('side_r_bar', 'side_r_track', {
        axis: 'vertical',
        range: $R(0, width_r),
        onSlide: function(v) { scrollVertical(v, $('side_right'), slider_r);  },
        onChange: function(v) { scrollVertical(v, $('side_right'), slider_r); }
    });

    //if slider not needed hide it, else create it
    if ($('side_right').scrollHeight <= $('side_right').offsetHeight) {
        slider_r.setDisabled();
        $('side_r_wrap').hide();
    }
    
    Event.observe('side_right', 'DOMMouseScroll', wheel_r); // mozilla
    Event.observe('side_right', 'mousewheel', wheel_r); // IE/Opera
});


//mouse scrolling right
function handle_r(delta) {
	slider_r.setValueBy(-delta);
}

function wheel_r(event){
	var delta = 0;
	if (!event)
		event = window.event;
	if (event.wheelDelta) { // IE Opera
		delta = event.wheelDelta/6;
	} else if (event.detail) { // Mozilla
		delta = -event.detail*2;
	}
	if (delta)
		handle_r(delta);

	if (event.preventDefault)
		event.preventDefault();
	
	event.returnValue = false;
}