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 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 checknumbers(field)
{
	var field = field
	var valid = "0123456789."
	var ok = "yes";
	var temp;
	for (var i=0; i<field.length; i++) 
		{
			temp = "" + field.substring(i, i+1);
			if (valid.indexOf(temp) == "-1") 
			ok = "no";
		}
	if (ok == "no" || field=="") 
	{
		return false;
	}
	return true;
}

function checkradio(field) {
    var cnt = -1;
    for (var i=field.length-1; i > -1; i--) {
        if (field[i].checked) {cnt = i; i = -1;}
    }
    if (cnt > -1)
		 return true;
    else 
		return false;
}
                  

function val(field,fieldtype,alerttxt)
{
	with (field)
	{
		if (fieldtype=="TextBox")
		{
			if (value==null||value=="")
			{alert(alerttxt); focus(); return false}
			else {return true}
		}
		
		if (fieldtype=="DateBox")
		{
			if (isDate(value)==false)
				{alert(alerttxt); focus(); return false}
			else {return true}
		}	
		
		if (fieldtype=="NumberBox")
		{
			if (checknumbers(value)==false)
				{alert(alerttxt); focus(); return false}
			else {return true}
		}
		
		if (fieldtype=="PhoneBox")
		{
			if (checknumbers(value)==false || value.length<3)
				{alert("Please enter a valid 10 digits value for " + alerttxt + "!"); focus(); return false}
			else {return true}
		}	
		
		if (fieldtype=="RadioBox" || fieldtype=="CheckBox")
		{
			if (checkradio(field)==false)
				{alert(alerttxt); focus(); return false}
			else {return true}
		}	
		
		if (fieldtype=="QuestionBox")
		{
			if (checkradio(field)==false)
				{alert(alerttxt); focus(); return false}
			else {return true}
		}	
		
		if (fieldtype=="CheckBoxOne")
		{
			if (field.checked==false)
				{alert(alerttxt); focus(); return false}
			else {return true}
		}	

		if (fieldtype=="EmailBox")
		{
			apos=value.indexOf("@")
			dotpos=value.lastIndexOf(".")
			if (apos<1||dotpos-apos<2) 
			  {alert(alerttxt); focus(); return false}
			else {return true}
		}		
	}
}