function hideElements (elementids) {
   if (elementids)
   for (i = 0;i < elementids.length;i++) {
      document.getElementById(elementids[i]).style.display='none';
   }
}

function showElements (elementids) {
   if (elementids)
   for (i = 0;i < elementids.length;i++) {
      document.getElementById(elementids[i]).style.display='block';
   }
}

function nozeros(input) {
	if((input.length > 1) && (input.substr(0,1) == "0"))
		  return input.substr(1);
	else
		  return input;
}

function timestamp(y,mo,d,h,mi,s) {
	var humDate = new Date(Date.UTC(y, (nozeros(mo)), nozeros(d), nozeros(h),  nozeros(mi),  nozeros(s)));
	return (humDate.getTime()/1000.0);
}