function checkdate(objName) {
var datefield = objName;
if (chkdate(objName) == false) {
datefield.select();
alert("Ungültiges Datum. Versuchen Sie es nochmal oder wählen Sie den 'Datum auswählen' - Knopf.");
datefield.focus();
return false;
}
else {
return true;
   }
}
function chkdate(objName) {
//var strDatestyle = "US"; //United States date style
var strDatestyle = "EU";  //European date style
var strDate;
var strDateArray;
var strDay;
var strMonth;
var strYear;
var intday;
var intMonth;
var intYear;
var booFound = false;
var datefield = objName;
var strSeparatorArray = new Array("-"," ","/",".");
var intElementNr;
var err = 0;
var strMonthArray = new Array(12);
strMonthArray[0] = "Jan";
strMonthArray[1] = "Feb";
strMonthArray[2] = "Mar";
strMonthArray[3] = "Apr";
strMonthArray[4] = "May";
strMonthArray[5] = "Jun";
strMonthArray[6] = "Jul";
strMonthArray[7] = "Aug";
strMonthArray[8] = "Sep";
strMonthArray[9] = "Oct";
strMonthArray[10] = "Nov";
strMonthArray[11] = "Dec";
strDate = datefield.value;
if (strDate.length < 1) {
return true;
}

var jetzt = new Date();
var Jahr = jetzt.getFullYear();

for (intElementNr = 0; intElementNr < strSeparatorArray.length; intElementNr++) {
if (strDate.indexOf(strSeparatorArray[intElementNr]) != -1) {
	strDateArray = strDate.split(strSeparatorArray[intElementNr]);
	//alert(strDateArray.length);
	//add current year by default -- by matthias
	if (strDateArray.length == 2) {
		strDate = strDate + strSeparatorArray[intElementNr] + Jahr;
		strDateArray = strDate.split(strSeparatorArray[intElementNr]);
	}
	//end current year -- by matthias
	
	if (strDateArray.length != 3) {
		err = 1;
		return false;
	}else {
		strDay = strDateArray[0];
		strMonth = strDateArray[1];
		if (strDateArray[2] == ''){
			strYear=Jahr;
		}else{
			strYear = strDateArray[2];
		}
		
	}
	booFound = true;
   }
}
if (booFound == false) {
if (strDate.length>5) {
strDay = strDate.substr(0, 2);
strMonth = strDate.substr(2, 2);
strYear = strDate.substr(4);
   }
}
if (strYear.length == 2) {
strYear = '20' + strYear;
}
// US style
if (strDatestyle == "US") {
strTemp = strDay;
strDay = strMonth;
strMonth = strTemp;
}
intday = parseInt(strDay, 10);
if (isNaN(intday)) {
err = 2;
return false;
}
intMonth = parseInt(strMonth, 10);
if (isNaN(intMonth)) {
for (i = 0;i<12;i++) {
if (strMonth.toUpperCase() == strMonthArray[i].toUpperCase()) {
intMonth = i+1;
strMonth = strMonthArray[i];
i = 12;
   }
}
if (isNaN(intMonth)) {
err = 3;
return false;
   }
}
intYear = parseInt(strYear, 10);
if (isNaN(intYear)) {
err = 4;
return false;
}
if (intMonth>12 || intMonth<1) {
err = 5;
return false;
}
if ((intMonth == 1 || intMonth == 3 || intMonth == 5 || intMonth == 7 || intMonth == 8 || intMonth == 10 || intMonth == 12) && (intday > 31 || intday < 1)) {
err = 6;
return false;
}
if ((intMonth == 4 || intMonth == 6 || intMonth == 9 || intMonth == 11) && (intday > 30 || intday < 1)) {
err = 7;
return false;
}
if (intMonth == 2) {
if (intday < 1) {
err = 8;
return false;
}
if (LeapYear(intYear) == true) {
if (intday > 29) {
err = 9;
return false;
}
}
else {
if (intday > 28) {
err = 10;
return false;
}
}
}
if (strDatestyle == "US") {
datefield.value = strMonthArray[intMonth-1] + " " + intday+" " + strYear;
}
else {
//datefield.value = intday + "." + intMonth + "." + strYear;
datefield.value = intday + "." + intMonth + "." + strYear;
}
return true;
}
function LeapYear(intYear) {
if (intYear % 100 == 0) {
if (intYear % 400 == 0) { return true; }
}
else {
if ((intYear % 4) == 0) { return true; }
}
return false;
}
function doDateCheck(from, to) {
if (Date.parse(from.value) <= Date.parse(to.value)) {
alert("The dates are valid.");
}
else {
if (from.value == "" || to.value == "") 
alert("Both dates must be entered.");
else 
alert("To date must occur after the from date.");
   }
}



// Matthias
function IsValidTime(timeStr) {
	if(timeStr != ''){
		var timePat = /^(\d{1,2}):(\d{2})?$/;
		var matchArray = timeStr.match(timePat);
		if (matchArray == null) {
			alert("Ungültiges Zeitformat");
			return false;
		}
		
		hour = matchArray[1];
		minute = matchArray[2];
		
		if (hour < 0 || hour > 23) {
			alert("Ungültige Stundenangabe");
			return false;
		}

		if (minute < 0 || minute > 59) {
			alert ("Ungültige Minutenangabe");
			return false;
		}			
	}

	return true;
}


function callDateBuilder(sPath) {
	//Start Time
	if(document.entryForm.client_request_startHH.value == ''){
		document.entryForm.client_request_timeStart.value = '';
	}else{
		if(document.entryForm.client_request_startMM.value == ''){
			document.entryForm.client_request_startMM.value = '00';
		}
		document.entryForm.client_request_timeStart.value = document.entryForm.client_request_startHH.value + ':' + document.entryForm.client_request_startMM.value;
	}
	//End Time
	if(document.entryForm.client_request_endHH.value == ''){
		document.entryForm.client_request_timeEnd.value = '';
	}else{
		if(document.entryForm.client_request_endMM.value == ''){
			document.entryForm.client_request_endMM.value = '00';
		}
		document.entryForm.client_request_timeEnd.value = document.entryForm.client_request_endHH.value + ':' + document.entryForm.client_request_endMM.value;
	}

	if (IsValidTime(document.entryForm.client_request_timeStart.value) && IsValidTime(document.entryForm.client_request_timeEnd.value)){
		foo = window.open(sPath + "/openmedia/om_eventcalendar/writeDownSingleDate.htm?client_request_startDate=" + document.entryForm.client_request_EventStart.value + "&client_request_startTime=" + document.entryForm.client_request_timeStart.value + "&client_request_endTime=" + document.entryForm.client_request_timeEnd.value + "&client_request_vvState=" + document.entryForm.client_request_vvState.value + "&client_request_vvDate=" + document.entryForm.client_request_vvDate.value + "&client_request_agencyId=" + document.entryForm.client_request_agencyId.value,"","width=400,height=400,left=0,top=0");
	}
}