function isSelected(elm)
{
   if (elm.selectedIndex == "" || elm.selectedIndex == null)
   return false;
   else return true;
}

//************ date check ***************
//usage if (isDate(dt.value)==false) { return false }
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 : 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
}


//******************    end date check    ***********************	


function isFilled(elm){
   if (elm.value == null || elm.value == "" || elm.value.substring(0, 1) == " ")
   return false;
   else return true;
}

function checkFaq(FaqJsWarning)
{
	var formulier = document.faqForm;
	var getallen = "0123456789";
	var nummerOK = "yes";
	var temp;	
	
	if (isFilled(formulier.faq_name) == false)
		{
			alert(FaqJsWarning);
			formulier.faq_name.focus()
			return false;
		}
	return true;
}
	

function emailcheck(emailStr)
{   var emailPat=/^(.+)@(.+)$/
    var specialChars="\\(\\)<>@,;:\\\\\\\"\\.\\[\\]"
    var validChars="\[^\\s" + specialChars + "\]"
    var quotedUser="(\"[^\"]*\")"
    var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/
    var atom=validChars + '+'
    var word="(" + atom + "|" + quotedUser + ")"
    var userPat=new RegExp("^" + word + "(\\." + word + ")*$")
    var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$")

    var matchArray=emailStr.match(emailPat)
    if (matchArray==null) {
//        alert("Uw e-mail adres lijkt incorrect (check @ en punten)")
		alert("Please enter a valid e-mail address")
	    return false
    }

    var user=matchArray[1]
    var domain=matchArray[2]

    // See if "user" is valid
    if (user.match(userPat)==null) {
        // user is not valid
//        alert("Het deel voor het @ in uw e-mail adres is niet correct (of een emailadres bevat slechts 1 @).")
		alert("Please enter a valid e-mail address")
        return false
    }

    var IPArray=domain.match(ipDomainPat)
    if (IPArray!=null) {
        // this is an IP address
    	  for (var i=1;i<=4;i++) {
    	    if (IPArray[i]>255) {
//    	        alert("Het door u opgegeven e-mail adres bevat een ongeldig IP adres!")
				alert("Please enter a valid e-mail address")
    		return false
    	    }
        }
        return true
    }

    // Domain is symbolic name
    var domainArray=domain.match(domainPat)
    if (domainArray==null) {
//    	alert("De in uw e-mail adres opgegeven domain naam is ongeldig.")
		alert("Please enter a valid e-mail address")
        return false
    }

    /* Now we need to break up the domain to get a count of how many atoms
       it consists of. */
    var atomPat=new RegExp(atom,"g")
    var domArr=domain.match(atomPat)
    var len=domArr.length
    if (domArr[domArr.length-1].length<2 ||
        domArr[domArr.length-1].length>3 ||
		domArr[domArr.length-1] == "WAU" ||
		domArr[domArr.length-1] == "wau") {
       // the address must end in a two letter or three letter word.
//		alert("Een e-mail adres moet eindigen op een 3-letterig domein, of op een 2-letterige landcode.")
		alert("Please enter a valid e-mail address")
       return false
    }

    // Make sure there's a host name preceding the domain.
    if (len<2) {
       var errStr="Uw e-mail adres is niet volledig!"
//       alert(errStr)
		alert("Please enter a valid e-mail address")
       return false
    }
return true;
}