/**
 * DHTML date validation script. Courtesy of SmartWebby.com (http://www.smartwebby.com/dhtml/)
 */
// Declaring valid date character, minimum year and maximum year
var dtCh= "/";
var minYear=1900;
var maxYear=2100;

function isInteger(s){
 var i;
    for (i = 0; i < s.length; i++){  
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    // All characters are numbers.
    return true;
}

function stripCharsInBag(s, bag){
 var i;
    var returnString = "";
    // Search through string's characters one by one.
    // If character is not in bag, append to returnString.
    for (i = 0; i < s.length; i++){  
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function daysInFebruary (year){
 // February has 29 days in any year evenly divisible by four,
    // EXCEPT for centurial years which are not also divisible by 400.
    return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
}
function DaysArray(n) {
 for (var i = 1; i <= n; i++) {
  this[i] = 31;
  if (i==4 || i==6 || i==9 || i==11) {this[i] = 30;}
  if (i==2) {this[i] = 29;}
   }
   return this;
}

function isDate(dtStr){
 var daysInMonth = DaysArray(12);
 var pos1=dtStr.indexOf(dtCh);
 var pos2=dtStr.indexOf(dtCh,pos1+1);
 var strMonth=dtStr.substring(0,pos1);
 var strDay=dtStr.substring(pos1+1,pos2);
 var strYear=dtStr.substring(pos2+1);
 strYr=strYear;
 if (strDay.charAt(0)=="0" && strDay.length>1) strDay=strDay.substring(1);
 if (strMonth.charAt(0)=="0" && strMonth.length>1) strMonth=strMonth.substring(1);
 for (var i = 1; i <= 3; i++) {
  if (strYr.charAt(0)=="0" && strYr.length>1) strYr=strYr.substring(1);
 }
 month=parseInt(strMonth);
 day=parseInt(strDay);
 year=parseInt(strYr);
 //if (pos1==-1 || pos2==-1){
 // alert("The date format should be : mm/dd/yyyy");
 // return false;
 //}
 if (dtStr.length > 0){
	 if (strMonth.length<1 || month<1 || month>12){
	  alert("Please enter a valid month");
	  return false;
	 }
	 if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
	  alert("Please enter a valid day");
	  return false;
	 }
	// if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
	//  alert("Please enter a valid 4 digit year between "+minYear+" and "+maxYear);
	if (strYear.length != 4 || year==0){
	  alert("Please enter a valid 4 digit year");
	  return false;
	 }
	 if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
	  alert("Please enter a valid date");
	  return false;
	 }
 }
return true;
}

function ValidateForm(){ 
 var dt0=document.search.begindt;
 var dt1=document.search.enddt;
 if (isDate(dt0.value)==false){
  dt0.focus();
  return false;
 }
 if (isDate(dt1.value)==false){
  dt1.focus();
  return false;
 }
 if ((dt0.value != "") && (dt1.value != "") && (dt0.value >= dt1.value)){
	 alert("Arrival date must be before the Departure date");
	 dt0.focus();
	 return false;
 }
	return true;
 }