function toggleVisibility(id) {
	switch(id) {
		case 1:
			document.getElementById('catprog').style.display = 'none';
			document.getElementById('catprod').style.display = 'table-row'; 
			break;
		case 2:
			document.getElementById('catprod').style.display = 'none'; 
			document.getElementById('catprog').style.display = 'table-row';
			break;
		case 3:
			document.getElementById('catprod').style.display = 'none'; 
			document.getElementById('catprog').style.display = 'none';
			break;
		case 4:
			document.getElementById('catprod').style.display = 'none'; 
			document.getElementById('catprog').style.display = 'none';
	}
}