function GetLocalTimeOffset()
{
  var rightNow = new Date();
  var hoursDiffStdTime = - (rightNow.getTimezoneOffset() / 60);
  createCookie("hoursDiffStdTime", hoursDiffStdTime); 
}
function createCookie(name,value) 
{
  document.cookie = name+"="+value+"; path=/; expires=Thu, 01-Jan-2100 00:00:01 GMT";
}