// JavaScript Document


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 strDay=dtStr.substring(0,pos1)
	var strMonth=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 : dd/mm/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 between "+minYear+" and "+maxYear)
		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 chkfds() {
 if(form1.firstname.value=="") {
 alert("Please enter your first name");
 form1.firstname.focus();
 return(false);
  } 
 if(form1.lastname.value=="") {
		alert("Please enter your last name");
		form1.lastname.focus();
		return(false);
	}
	if(form1.add1.value=="") {
		alert("Please enter your street address");
		form1.add1.focus();
		return(false);
	}
	if(form1.city.value=="") {
		alert("Please enter the town / city where you live");
		form1.city.focus();
		return(false);
	}
	if(form1.pcode.value=="") {
		alert("Please enter your postcode");
		form1.pcode.focus();
		return(false);
	}
	if(form1.tel1.value=="") {
		alert("Please enter your preferred contact telephone number");
		form1.tel1.focus();
		return(false);
	}
	if(form1.call.selectedIndex==0) {
		alert("Please select the best time to call you");
		form1.call.focus();
		return(false);
	}
	if(form1.email.value=="") {
		alert("Please enter your email address");
		form1.email.focus();
		return(false);
	}
	validemail=0;
var checkStr = form1.email.value;
for (i = 0; i < checkStr.length; i++){
	if(checkStr.charAt(i)=="@")
		validemail |= 1;
	if(checkStr.charAt(i)==".")
		validemail |= 2;
}
if(validemail != 3){
	alert("Please enter a valid email address");
	form1.email.focus();
	return (false);
}
var dt=document.form1.txtDate
	if (isDate(dt.value)==false){
		dt.focus()
		return false
	}
	if(form1.acc.selectedIndex==0) {
	alert("Please select the type of accident");
	form1.acc.focus();
	return(false);
}
	if(form1.hear_us.selectedIndex==0) {
		alert("To enable us to improve customer services, please select how you heard about us");
		form1.hear_us.focus();
		return(false);
	}
if(form1.happen.value=="") {
	alert("Please enter a brief description of how your accident happened");
	form1.happen.focus();
	return(false);
}
if(form1.injury.value=="") {
	alert("Please enter a brief description of your injury");
	form1.injury.focus();
	return(false);
}

return true
 }