// anticipates two 3-element arrays representing 3d vectors, returns a 3-element array representing their cross-product
function crossProduct(a, b) {
	return [(a[1] * b[2]) - (a[2] * b[1]), 
			(a[2] * b[0]) - (a[0] * b[2]), 
			(a[0] * b[1]) - (a[1] * b[0])];
}

// anticipates two 3-element arrays, returns scalar value
function dotProduct(a, b) {
	return (a[0] * b[0]) + (a[1] * b[1]) + (a[2] * b[2]);
}

function spherePointAngle(A, B, C) { // returns angle at B
    return Math.atan2(dotProduct(crossProduct(C, B), A), dotProduct(crossProduct(B, A), crossProduct(B, C)));
}

// returns 3-element array representing cartesian location of a point given by a GLatLng object
function cartesianCoordinates(latlng) {
    var x = Math.cos(latlng.latRadians()) * Math.sin(latlng.lngRadians());
    var y = Math.cos(latlng.latRadians()) * Math.cos(latlng.lngRadians());
    var z = Math.sin(latlng.latRadians());
	return [x, y, z];
}





function windowHeight() {
	// Standard browsers (Mozilla, Safari, etc.)
	if (self.innerHeight)
		return self.innerHeight;
	// IE 6
	if (document.documentElement && document.documentElement.clientHeight)
		return document.documentElement.clientHeight;
	// IE 5
	if (document.body)
		return document.body.clientHeight;
	// Just in case.
	return 0;
}

function handleResize() {
	var height = windowHeight() - document.getElementById('toolbar').offsetHeight - 30;
	document.getElementById('map').style.height = height + 'px';
	document.getElementById('sidebar').style.height = height + 'px';
}

function changeBodyClass(from, to) {
     document.body.className = document.body.className.replace(from, to);
     return false;
}







//window.onresize = handleResize;
	
//window.onunload = GUnload;