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(e){
	var dtStr=e.value
	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){
		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 trim(str)
{
	return str.replace(/^\s*|\s*$/g,"");
}
function validation(a,b,c,d,e)
			{  var str="Enter Value In:\n";
				if (trim(a.value)=="")
				{	str= str+ "Qualification \n";
				}
				if (trim(b.value)=="")
					str = str + "Course Title \n"
				if (trim(c.value)=="")
					str = str + "Qualification/Grade \n"
				if (trim(d.value)=="")
					str = str + "Awarding Body \n"
				if (trim(e.value)=="")
					str = str + "Date \n"
				if (str.length>16)
				{	alert(str)
					return false
				}
					
				if (!isDate(e))
					{alert("Date format must be DD/MM/YYYY")
					return false}
			}
function validation2(a,b,c)
			{  var str="Enter Value In:\n";
				
				if (trim(a.value)=="")
					str+="Title \n";
				if (trim(b.value)=="")
					str = str + "Awarding body \n";
				if (trim(c.value)=="")
					str = str + "Date";
				if (str.length>16)
				{	alert(str)
					return false
				}
					
				if (!isDate(c))
					{alert("Date format must be DD/MM/YYYY")
					return false}
									

			}
function checkLogIn(name,pass,lbl)
{	var str="";
	name= document.getElementById(name);
	pass= document.getElementById(pass);
	if (trim(name.value)=="" || trim(name.value.toLowerCase())=="user name")
		str="Enter the user name"
	else 
		if (trim(pass.value)=="")
		str="Enter the password"
	if (str!="")
	{	lbl =document.getElementById(lbl);
		lbl.innerText=str;	
		return false}
	return true
}