function toggle(toggleId) 
{ 
    var body = document.getElementById(toggleId); 
    var im = toggleId + "_toggle"; 
    if (body.className == 'hideanswer') { 
		body.className = 'showanswer';
		body.style.display = 'block';
        document.images[im].src = "minus.jpg"; 
    } else { 
        body.className = 'hideanswer';
		body.style.display = 'none';
        document.images[im].src = "plus.jpg"; 
    } 
}