A JS to toggle scrolling w/o hiding scrollbar

disable-scroll.js

// disable scrolling without hiding scrolbar
document.onmousewheel=document.onwheel=function(){ 
	return false;
};
document.addEventListener("MozMousePixelScroll",function(){return false},false);
document.onkeydown=function(e) {
	if (e.keyCode>=33&&e.keyCode<=40) return false;
}

// enabling in again

document.onmousewheel=document.onwheel=function(){ 
	return true;
};
document.addEventListener("MozMousePixelScroll",function(){return true},true);
document.onkeydown=function(e) {
	if (e.keyCode>=33&&e.keyCode<=40) return true;
}