function fnExternalSite() {
    window.open("https://www.thebookingbutton.com.au/public/reservation/PropertyOverview.do?channelCode=KANGAROOVGCRDIRECT");
}

function checkAvailability()
{
     window.open("https://www.thebookingbutton.com.au/public/reservation/PropertyOverview.do?channelCode=KANGAROOVGCRDIRECT&dateFrom=" + $(".ddlMonths").val() + "-" + $(".ddlDays").val());
}