function checkbox(checkbox_id){
  var box=document.getElementById(checkbox_id);
  var imgbox=document.getElementById(checkbox_id+'_imgbox');
  if(box.checked){
    box.checked=false;
    imgbox.src='/images/checkbox_off.gif';
    document.getElementById('sbm').disabled=true;
  }else{
    box.checked=true;
    imgbox.src='/images/checkbox_on.gif';
    document.getElementById('sbm').disabled=false;
  }
}

function change_status(stat){
    if(!stat){
      document.getElementById('done').style.display='inline';
      document.getElementById('done').style.visibility='visible';
    }else{
      document.getElementById('done').style.display='none';
      document.getElementById('done').style.visibility='hidden';
    }
}

function show_error(){
  change_status(0);
  setTimeout('change_status(1);',2000);
}

function openVideo(url){
    window.open(url,"videowindow","toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=no,width=300,height=250");
}
if(!getCookie('newWinCounter')) createCookie('newWinCounter','0',1);
function open_window(link,w,h){
  var newWinCounter=getCookie('newWinCounter');
  var top = (screen.height - h) / 2;
  var left = (screen.width - w) / 2;
  var win = "width="+(w+20)+",height="+(h+20)+",top="+top+",left="+left+",menubar=no,location=no,resizable=yes,scrollbars=yes";
  newWin = window.open(link,'newWin'+newWinCounter,win);
  newWinCounter
  newWin.focus();
  createCookie('newWinCounter',newWinCounter+1,1);
}
function createCookie(name,value,days) {
  if (days) {
    var date = new Date();
    date.setTime(date.getTime()+(days*24*60*60*1000));
    var expires = "; expires="+date.toGMTString();
  }
  else var expires = "";
  document.cookie = name+"="+value+expires+"; path=/";
}

function getCookie(name) {
  var nameEQ = name + "=";
  var ca = document.cookie.split(';');
  for(var i=0;i < ca.length;i++) {
    var c = ca[i];
    while (c.charAt(0)==' ') c = c.substring(1,c.length);
    if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
  }
  return null;
}

function eraseCookie(name) {
  createCookie(name,"",-1);
}

function photo_div(){
  if(document.getElementById('photo_div').style.display=='none'){
    document.getElementById('photo_div').style.display='inline';
    document.getElementById('photo_div').style.visibility='visible';
  }else{
    document.getElementById('photo_div').style.display='none';
    document.getElementById('photo_div').style.visibility='hidden';
  }
}