function setCheckbox(img,id,formname) {
  if (document[formname][id].value=="0") {
    document[img].src = "./img/checkbox_true.gif";
    document[formname][id].value = "1";
  } else {
    document[img].src = "./img/checkbox_false.gif";
    document[formname][id].value = "0";
  }
}

//pop-up
function PopUp(url,n,w,h,r,s) {
  window.open(url,n,'width=' + w + ',height=' + h + ',toolbar=0,location=0,directories=0,status=0,menubar=0,resizable=' + r + ',scrollbars=' + s + ',top=100,left=100')
}