function getElementsByClassName(cl) {
	var retnode = [];
	var myclass = new RegExp('\\b'+cl+'\\b');
	var elem = document.getElementsByTagName("*");
	for (var i = 0; i < elem.length; i++) {
		var classes = elem[i].className;
		if (myclass.test(classes)) {
			retnode.push(elem[i]);
		}
	}
	return retnode;
}

function showonlyone(thechosenone) {
	var testing = getElementsByClassName('toggle');
	for(var z = 0; z<testing.length; z++) { 
		if (testing[z].id == thechosenone) {
			testing[z].style.display = 'block';
		} else {
			testing[z].style.display = 'none';
		}
	}
}