function mouseover(selector){javascript:document.getElementById(selector).style.backgroundPosition = 'top left'}
function mouseout(selector){javascript:document.getElementById(selector).style.backgroundPosition = 'bottom left'}


function toggle(id) {
var state = document.getElementById(id).style.display;
if (state == 'block') {
document.getElementById(id).style.display = 'none';
} else {
document.getElementById(id).style.display = 'block';
}
}