function doDateCheck(from, to) {
    var dateValid = true;
    var trip = getRadioCheckedValue("tripType");
    
    if(trip == "Round Trip") {
        if(from.value != "" && to.value != "") {
            if (from.value <= to.value) {
            } else {
                alert("Return Date must occur on or after the Departure Date.");
                dateValid = false;
            }
        }
        if(from.value == "" && to.value == "") {
            alert("You must enter Departure and Return Dates.");
            dateValid = false;
        }
        if(from.value == "" && to.value != "") {
            alert("You must enter a Departure Date.");
            dateValid = false;
        }
        if(from.value != "" && to.value == "") {
            alert("You must enter a Return Date.");
            dateValid = false;
        }
   }
   if(trip == "One Way") {
        if(from.value != "") {
        } else {
            alert("You must enter a Departure Date.");
            dateValid = false;
       }
   }
   return dateValid;
}

function getRadioCheckedValue(radio_name) {
var oRadio = document.forms["searchFlt"].elements[radio_name];

for(var i = 0; i < oRadio.length; i++) {
    if(oRadio[i].checked) {
    return oRadio[i].value;
    }

}

return '';
}