//To get user time zone
	var tzo = readCookie( 'tzo' );
	if( tzo == null || tzo.length == 0 ) {
		tzo = (new Date().getTimezoneOffset()/60)*(-1);
		createCookie( 'tzo', tzo, 1 );
	}
	
	// Find Math plugin.
	var mathplugin=readCookie( 'mathplugin' );
	if( mathplugin == null || mathplugin.length == 0 ) {
		mathplugin = hasMathMLPlugin() ? 1 : 0;
		createCookie( 'mathplugin', mathplugin, 1 );
	}