function checkRadioButton(formName,fieldName) {

	var foundOne = false;
	var len = eval("document."+formName+"."+fieldName+".length");
	
	for (i = 0; i <len; i++) {
		var checked = eval("document."+formName+"."+fieldName+"[i].checked");
		if(checked) {
			foundOne = true;
		}
	}
		
	return foundOne;
}




function getSelectedValue(objId) {
	return $(objId).options[$(objId).options.selectedIndex].value;
}
function isNumeric(strString) {
   
   var strValidChars = "0123456789.-,";
   var strChar;
   var blnResult = true;

   if (strString.length == 0) return false;
   for (i = 0; i < strString.length && blnResult == true; i++) {
      strChar = strString.charAt(i);
      if (strValidChars.indexOf(strChar) == -1) {
         blnResult = false;
       }
   }
   return blnResult;
}



function checkEmail(email) {
	
	var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	return filter.test(email);
}

function jumpToField(curField,toField,maxLen) {
	var curFieldVal = curField.value;
	if(curFieldVal.length==maxLen) {
		$(toField).focus();
	}
	
	
}


function displayError(errorMsg) {
	$('foutmeldingHolder').style.display = 'block';
	$('foutmeldingMsg').innerHTML = errorMsg;
	
	Effect.ScrollTo('top');
	
	
	
}

function compareFields(field1,field2) {
	return field=field2;
}

function hideError() {
	$('foutmeldingHolder').style.display = 'none';
	var focusField = $('hiddenFocusser').value;
	if($(focusField)) {
		Effect.ScrollTo(focusField);
		$(focusField).focus();
	}
}

function markField(field,errorMsg) {

	if($(field)) {
		$(field).style.backgroundColor = '#EFEFEF';
		$(field).style.color = '#000000';
		$(field).style.borderColor = '#009999';
		$('hiddenFocusser').value = field;
		displayError(errorMsg);
		
	} else {
		displayError(errorMsg);
	}
	
	
}
function unMarkField(field) {
	if($(field)) {
		$(field).style.backgroundColor = '';
		$(field).style.color = '';
		$(field).style.borderColor = '';
	}
}
function verifySchoolEmail(sEmail) {
		new Ajax.Updater('responseListenerExtended','index.php?mode=xmlGateway&loadComponent=schoolController&schoolAction=displayVerifyEmail&sEmail='+sEmail,{evalScripts:true});
}
function verifyStudentEmail(sEmail) {
		new Ajax.Updater('responseListenerExtended','index.php?mode=xmlGateway&loadComponent=studentController&studentAction=displayVerifyEmail&sEmail='+sEmail,{evalScripts:true});
}

function verifyStudentPostal(sPostal) {
		new Ajax.Updater('responseListenerExtended','index.php?mode=xmlGateway&loadComponent=studentController&studentAction=displayPostalCheck&sPostcode='+sPostal,{evalScripts:true});
}

function verifyStudentSofiNummer(sSofiNummer) {
		new Ajax.Updater('responseListenerExtended','index.php?mode=xmlGateway&loadComponent=studentController&studentAction=displaySofiNummerCheck&sSofiNummer='+sSofiNummer,{evalScripts:true});
}


// Declaring valid date character, minimum year and maximum year
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
}