function setCookie (cName,cValue,cExpire)	{
	document.cookie = cName+"="+escape(cValue)+";expires="+cExpire;
	return null;
}

function getCookie ( cookie_name )
{
  var results = document.cookie.match ( '(^|;) ?' + cookie_name + '=([^;]*)(;|$)' );

  if ( results && results != '' )
    return ( unescape ( results[2] ) );
  else
    return null;
}

function expiryDate ()
{
	var today = new Date();
	var tomorrow = new Date();
	tomorrow.setTime(today.getTime() + 30 * 60 * 1000);
	return tomorrow.toGMTString();
}

function deleteCookie (cName)	{
	var today = new Date();
	var tomorrow = new Date();
	tomorrow.setTime(today.getTime() - 1);
	document.cookie = cName+"="+null+";expires="+tomorrow.toGMTString();
	return null;
}