function toggleDiv(id, id2, id3) {
     var elt = document.getElementById(id);
     elt.style.display = (elt.style.display == 'block') ? 'none' : 'block';
 
     var elt = document.getElementById(id2);
     elt.style.display = 'none';
     
     var elt = document.getElementById(id3);
     elt.style.display = 'none';
 
}

 function showblock(id) {
     var elt = document.getElementById(id);
     elt.style.display = (elt.style.display == 'block') ? 'none' : 'block';
}

function confirm_url(msg, url) {
var answer=confirm(msg);
if (answer)
window.location=url;
return answer;
}