var _ErrorChars
// function:	ValidString
// Purpose:		Takes a string and makes sure that it is a valid string.
function ValidString( checkStr, strExtra, bNumbers )
{
	// set variables
	var checkOK = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
	var allValid = true;

	_ErrorChars = ""
	
	checkOK += strExtra;
	if (bNumbers)
		checkOK += "1234567890";
			
	// run through the checkStr, one character at a time...
	for (i = 0;  i < checkStr.length;  i++){
		ch = checkStr.charAt(i);

		// check the character against each one in the comparison string
		for (j = 0;  j < checkOK.length;  j++)
			if (ch == checkOK.charAt(j))
				break;
		if (j == checkOK.length){
			allValid = false;
			_ErrorChars = _ErrorChars + ch
			//break;
		}
	}
	
	// return the status of the comparison
	if (allValid){
		return (true);
	} else {
		return (false);
	}
}

// function:	ValidNumber
// Purpose:		Takes a string and makes sure that it is a number.  If the 'dot' flag is
//				true then there can be a dot in it
function ValidNumber( checkStr, dot )
{
	// set variables
	var checkOK = "-1234567890";
	var allValid = true;
	var dotCount = 0;
	
	_ErrorChars = ""

// dot has been allowed so add it to the comparison string
	if (dot){
		checkOK = checkOK + "."
	}
	
	// run through the checkStr, one character at a time...
	for (i = 0;  i < checkStr.length;  i++){
		ch = checkStr.charAt(i);

		// if the character is a '.' then keep a count of it
		if (ch == '.'){
			dotCount++;
		}
		// check the character against each one in the comparison string
		for (j = 0;  j < checkOK.length;  j++)
			if (ch == checkOK.charAt(j))
				break;
		if (j == checkOK.length){
			allValid = false;
			break;
		}
	}
	// if there is more than 1 '.' in the string then this is an error
	if (dot && dotCount > 1){
		allValid = false
	}
	
	// return the status of the comparison
	if (allValid){
		return (true);
	} else {
		return (false);
	}
}

// function:	ValidTelephoneNumber
// Purpose:		Takes a string and makes sure that it has the makings of a telephone number.
function ValidTelephoneNumber( checkStr )
{
	// set variables
	var checkOK = "1234567890()+- ";
	var allValid = true;
	
	_ErrorChars = ""

// run through the checkStr, one character at a time...
	for (i = 0;  i < checkStr.length;  i++){
		ch = checkStr.charAt(i);

		// check the character against each one in the comparison string
		for (j = 0;  j < checkOK.length;  j++)
			if (ch == checkOK.charAt(j))
				break;
		if (j == checkOK.length){
			allValid = false;
			break;
		}
	}
	
	// return the status of the comparison
	if (allValid){
		return (true);
	} else {
		return (false);
	}
}

// function:	ValidEmail
// Purpose:		Takes a string and makes sure that it is a valid email address.
function ValidEmail( checkStr )
{
	// set variables
	var checkOK = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890@.";
	var allValid = true;

	_ErrorChars = ""

// run through the checkStr, one character at a time...
	for (i = 0;  i < checkStr.length;  i++){
		ch = checkStr.charAt(i);

		// check the character against each one in the comparison string
		for (j = 0;  j < checkOK.length;  j++)
			if (ch == checkOK.charAt(j))
				break;
		if (j == checkOK.length){
			allValid = false;
			break;
		}
	}
	
	// return the status of the comparison
	if (allValid){
		return (true);
	} else {
		return (false);
	}
}

// function:	ValidDate
// Purpose:		Takes a string and makes sure that it is a valid email address.
function ValidDate(dtStr, dtCh){
	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 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" + dtCh + "mm" + dtCh + "yyyy")
		return false
	}
	if (strMonth.length<1 || month<1 || month>12){
		alert("Please enter a valid month (dd.mm.yyyy)")
		return false
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		alert("Please enter a valid day (dd.mm.yyyy)")
		return false
	}
	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		alert("Please enter a valid 4 digit year between "+minYear+" and "+maxYear+" (dd.mm.yyyy)")
		return false
	}
	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
		alert("Please enter a valid date (dd.mm.yyyy)")
		return false
	}
	return true
}

/**
 * DHTML date validation script. Courtesy of SmartWebby.com (http://www.smartwebby.com/dhtml/)
 */
// Declaring valid date character, minimum year and maximum year
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
}