function checkdate(objName) {
	var datefield = objName;
	if (chkdate(objName) == false) {
	datefield.select();
	alert("Date non valable...");
	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("Jan", "Fév", "Mar", "Avr", "Mai", "Jui", "Jul", "Aoû", "Sep", "Oct", "Nov", "Dec");
	
	strDate = datefield.value;
	if (strDate.length < 1) {
	return true;
	}
	for (intElementNr = 0; intElementNr < strSeparatorArray.length; intElementNr++) {
	if (strDate.indexOf(strSeparatorArray[intElementNr]) != -1) {
	strDateArray = strDate.split(strSeparatorArray[intElementNr]);
	if (strDateArray.length != 3) {
	err = 1;
	return false;
	}
	else {
	strDay = strDateArray[0];
	strMonth = strDateArray[1];
	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);
		}
	else {
	err = 11;
	return false;
		}
	}
	if (strYear.length == 2) {
	  if (parseInt(strYear, 10) < 30) {
	    strYear = '20' + strYear;
	  }
	  else {
	    strYear = '19' + strYear;
	  }
	}
	if (strYear.length == 1) {
	  strYear = '200' + strYear;
	}
	if (strYear.length == 3) {
	  strYear = strYear + '0';
	}
	
	// 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 + " " + strMonthArray[intMonth-1] + " " + strYear;
	strDate = "" + intday
	if (strDate.length == 1) 
	  datefield.value = "0" + intday
	else
	  datefield.value = intday
	strDate = "" + intMonth
	if (strDate.length == 1) 
	  datefield.value += ".0" + intMonth
	else
	  datefield.value += "." + intMonth
	
	datefield.value += "." + 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;
	}