Grab current scroll position (including horizontal axis). Set overflow to hidden (retain previous overflow value). Scroll document to stored scroll position with scrollTo(). *** THIS REQUIRES JQUERY. ***

disable-enable-scroll.js

//
//
// This Requires jQuery
//
//

var scrollIsEnabled;			// scroll state varialbe
scrollIsEnabled = true; 		// by default, scroll is enabled

// lock scroll position, but retain settings for later
function disableScroll() {
	// save page offsets
	var scrollPosition = [
    		self.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft,
    		self.pageYOffset || document.documentElement.scrollTop  || document.body.scrollTop
  	];
	// get the html object
	var html = jQuery('html'); 	// it would make more sense to apply this to body, but IE7 won't have that
	html.data('scroll-position', scrollPosition);
	html.data('previous-overflow', html.css('overflow'));
	html.css('overflow', 'hidden');
	window.scrollTo(scrollPosition[0], scrollPosition[1]);
}

// un-lock scroll position
function enableScroll() {
	var html = jQuery('html');
	var scrollPosition = html.data('scroll-position');
	html.css('overflow', html.data('previous-overflow'));
	window.scrollTo(scrollPosition[0], scrollPosition[1]);
}

/**
 *
 *	This is the function to place inside an event/another function,
 * 	or edit it to be an event itself.
 *
**/

// Check scroll state and take appropriate action
function toggleScroll() {
	
	// Check if scroll is enabled
	
	if(scrollIsEnabled === true) {
		// It is, so disable it
		disableScroll();
		// and update the current scroll state
		scrollIsEnabled = false;
	
	} else {
		// It is not, so enable it
		enableScroll();
		// and update the current scroll state
		scrollIsEnabled = true;
	}
}