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 ReadCookie(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 AddCookie ( name, value ) {
  //alert ( name+'-'+value ) ;
  var Ocookie ;
  Ocookie = ReadCookie(name) ;
  if ( Ocookie=='' )
    {
      CreateCookie(name,value,7) ;
    }
    else
    {
      var separ =':';
      EraseCookie(name) ;
      CreateCookie(name,Ocookie+separ+value,7) ;
    }
}