function change_button(button_id,col) {
	try {
		button = document.getElementById(button_id);
		if (col == "r") {
			src = "loginbuttonred.gif";
				} else if (col == "o") {
					src = "loginbutton.gif";
						}
		button.src = "http://www.camra.org.uk/images/" + src;
	}
	catch(err) {
		// catch the error
	}
}

function change_bullet(bullet_id, col) {
	try {
		bullet = document.getElementById(bullet_id);
		if (col == "r") {
			src = "bulletred.gif";
				} else if (col == "o") {
					src = "bullet.gif";
						}
		bullet.src = "http://www.camra.org.uk/images/" + src;
	}
	catch(err) {
		// catch the error
	}
}