function getSelectValue (id) {
	var selObj = document.getElementById (id) ;
	var selIndex = selObj.selectedIndex;
	return selObj.options[selIndex].value;
}

function openBookingPopup() {
	var dateIn = document.getElementById ('ctl00_ContentPlaceHolder1_DateIn').value ;
	//      var rooms = getSelectValue ('ctl00_ContentPlaceHolder1_Rooms');
	var length = getSelectValue ('ctl00_ContentPlaceHolder1_Length') ;
	var adults = getSelectValue ('ctl00_ContentPlaceHolder1_Adults') ;
	var children = getSelectValue ('ctl00_ContentPlaceHolder1_Children') ;

	var url = 'https://booking.ihotelier.com/istay/istay.jsp?HotelID=73716&LanguageID=1' ;
	url += '&Rooms=' + '1' ; // rooms ;
	url += '&DateIn=' + dateIn ;
	url += '&Length=' + length ;
	url += '&Children=' + children ;
	url += '&Adults=' + adults ;

	window.open(url,'','scrollbars=yes,top=50,left=500');
}