function toggle(nr) {
		var count = 0;
		var popups = 1;
		if (nr == 'clear') {
			for (i=0; i < popups; i++) {
			document.getElementById('popup'+count).style.display = 'none';
			count++;
			}
		}
		else {
			for (i=0; i < popups; i++) {
			document.getElementById('popup'+count).style.display = 'none';
			count++;
			}
		document.getElementById('popup'+nr).style.display = 'block';
		}
	}