var zoom = 1;

function zoomIn() {
    zoom += 0.1;
    document.body.style.zoom = zoom;
	document.body.style.MozTransform = 'scale('+zoom+')';
	document.body.style.webkitTransform = 'scale('+zoom+')';
}
function zoomOut() {
    zoom -= 0.1;
    document.body.style.zoom = zoom;
	document.body.style.MozTransform = 'scale('+zoom+')';
	document.body.style.webkitTransform = 'scale('+zoom+')';

}

function zoom100() {
	zoom = 1;
    document.body.style.zoom = zoom;
	document.body.style.MozTransform = 'scale('+zoom+')';
	document.body.style.webkitTransform = 'scale('+zoom+')';
}