function chngopts(c) {
	var duration = document.frmreserv.RentalDuration;
	var quantity = document.frmreserv.QUANTITY;
	//
	duration.options.length = 1;
	quantity.options.length = 1;
	//
	if (c == 1) {
		duration.options[duration.options.length] = new Option('1 hour - $15','1 hour - $15');
		duration.options[duration.options.length] = new Option('4 hour - $40','4 hour - $40');
		duration.options[duration.options.length] = new Option('8 hour - $60','8 hour - $60');
		//
		quantity.options[quantity.options.length] = new Option('1','1');
		quantity.options[quantity.options.length] = new Option('2','2');
		quantity.options[quantity.options.length] = new Option('3','3');
		quantity.options[quantity.options.length] = new Option('4','4');
		quantity.options[quantity.options.length] = new Option('5','5');
		quantity.options[quantity.options.length] = new Option('6','6');
		quantity.options[quantity.options.length] = new Option('7','7');
		quantity.options[quantity.options.length] = new Option('8','8');
		quantity.options[quantity.options.length] = new Option('9','9');
		quantity.options[quantity.options.length] = new Option('10','10');
		quantity.options[quantity.options.length] = new Option('11','11');
		quantity.options[quantity.options.length] = new Option('12','12');
	} else if (c == 2) {
		duration.options[duration.options.length] = new Option('1 hour - $30','1 hour - $30');
		duration.options[duration.options.length] = new Option('4 hour - $60','4 hour - $60');
		duration.options[duration.options.length] = new Option('8 hour - $90','8 hour - $90');		
		//
		quantity.options[quantity.options.length] = new Option('1','1');
	} else {
		return;
	}
	//
}