// 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 (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")
		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 trim(str)
{
	return str.replace(/^\s+|\s+$/g,'');
}
function validatephone(xxxxx) {
	 var maintainplus = '';
 	var numval = xxxxx.value
 	if ( numval.charAt(0)=='+' ){ var maintainplus = '+';}
 	curphonevar = numval.replace(/[\\A-Za-z!"£$%^&*+_={};:'@#~,.¦\/<>?|`¬\]\[]/g,'');
 	xxxxx.value = maintainplus + curphonevar;
 	var maintainplus = '';
 	xxxxx.focus;
}

function validate()
{

if(document.getElementById("txtEmail").value.length>0)
	{
		if(/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(document.getElementById("txtEmail").value))
		{
		}
		else
		{
			alert("Please enter a valid E-mail address");
			document.getElementById("txtEmail").focus();
			document.getElementById("txtEmail").select();
			return false;
		}
	}
	else
	{
			alert("Please enter your E-mail address");
			document.getElementById("txtEmail").focus();
			document.getElementById("txtEmail").select();
			return false;
	}

if(trim(document.getElementById("txtDayPhone").value)=="")
{
alert("Please enter a telephone number");
document.getElementById("txtDayPhone").focus();
return false;
}

if(trim(document.getElementById("txtpurpose").value)=="")
{
alert("Please enter the purpose of your flight.");
document.getElementById("txtpurpose").focus();
return false;
}
if(trim(document.getElementById("txtmobile").value)=="")
{
alert("Please enter your mobile number");
document.getElementById("txtmobile").focus();
return false;
}
/*if(trim(document.getElementById("txtDate1").value)=="")
{
alert("Please enter your Date");
document.getElementById("txtDate1").focus();
return false;
}

if(trim(document.getElementById("txtDate1").value)!="")
{
var dt=document.getElementById("txtDate1")
	if (isDate(dt.value)==false){
		dt.focus()
		return false
	}
}*/
if(trim(document.getElementById("txtorigin1").value)=="")
{
alert("Please enter your city of origin.");
document.getElementById("txtorigin1").focus();
return false;
}
if(trim(document.getElementById("txtDest1").value)=="")
{
alert("Please enter your Destination");
document.getElementById("txtDest1").focus();
return false;
}
if(trim(document.getElementById("txttime1").value)=="")
{
alert("Please enter the time of your requirement.");
document.getElementById("txttime1").focus();
return false;
}
if(trim(document.getElementById("txtnoguest").value)=="")
{
alert("Please enter the number of guests expected.");
document.getElementById("txtnoguest").focus();
return false;
}
if(isNaN(document.getElementById("txtnoguest").value))
{
alert("This field accepts only numbers. Please re-enter.");
document.getElementById("txtnoguest").value="";
document.getElementById("txtnoguest").focus();
return false;
}
if(trim(document.getElementById("txtlink").value)=="")
{
alert("Please enter your message");
document.getElementById("txtlink").focus();
return false;
}
document.getElementById("enquiry").submit();
}