function addDivvyBookingButton(host, divvy_id) {
	// PLEASE MAKE SURE ALL URLS ARE FULL URLS, NOT RELATIVE
	document.write("<a href='http://" + divvy_host + "/divvies/" + divvy_id + "/reservations/calendar'>");
	document.write("<img border=0 src='http://" + divvy_host + "/images/btn-reserve.gif'>")
	document.write("</a>")
}

// Sensible defaults
if (typeof(divvy_host) == 'undefined') { var divvy_host = 'www.divvy.com'; }
if (typeof(divvy_id) == 'undefined') { alert("divvy_id required"); }

addDivvyBookingButton(divvy_host, divvy_id);