function toggle(obj1,obj2) {
	var el1 = document.getElementById(obj1);
	var el2 = document.getElementById(obj2);
	var el3 = document.getElementById("features");
	if ( el1.style.display != "none" ) {
		el1.style.display = 'none';
		el2.style.display = 'block';
		el3.style.display = 'none';
	}
	else {
		el1.style.display = 'block';
		el2.style.display = 'none';
		el3.style.display = 'block';
	}
}