//check and uncheck all boxes

function un_check(){
  for (var i = 0; i < document.venuesearch.elements.length; i++) {
    var e = document.venuesearch.elements[i];
    if ((e.name != 'allbox') && (e.type == 'checkbox')) {
e.checked = document.venuesearch.all_days.checked;
    }
  }
}

document.venuesearch.all_days.onclick = un_check;