/* กำหนด cookie */
function setCookie( name , value , expires , path , domain , secure )
{
	var today = new Date();
	today.setTime( today.getTime() );
	if ( expires )
	{
		expires = expires * 1000 * 60 * 60 * 24;
	};
	var expires_date = new Date( today.getTime() + expires );
	document.cookie = name + "=" + escape( value ) +
		( ( expires ) ? ";expires=" + expires_date.toGMTString() : "" ) + 
		( ( path ) ? ";path=" + path : "" ) + 
		( ( domain ) ? ";domain=" + domain : "" ) +
		( ( secure ) ? ";secure" : "" );
};

/* อ่าน cookie */
function getCookie( name )
{
	var start = document.cookie.indexOf( name + "=" );
	var len = start + name.length + 1;
	if ( !start && ( name != document.cookie.substring( 0 , name.length ) ) )
	{
		return null;
	};
	if ( start == -1 )
	{
		return null;
	};
	var end = document.cookie.indexOf( ";" , len );
	if ( end == -1 )
	{
		end = document.cookie.length;
	};
	return unescape( document.cookie.substring( len , end ) );
};