function tarihkontrol(field){
var checkstr = "0123456789";
var DateField = field;
var Datevalue = "";
var DateTemp = "";
var seperator = ".";
var day;
var month;
var year;
var leap = 0;
var err = 0;
var i;
   err = 0;
   DateValue = DateField.value;
   /* Delete all chars except 0..9 */
   for (i = 0; i < DateValue.length; i++) {
	  if (checkstr.indexOf(DateValue.substr(i,1)) >= 0) {
	     DateTemp = DateTemp + DateValue.substr(i,1);
	  }
   }
   DateValue = DateTemp;
   /* Always change date to 8 digits - string*/
   /* if year is entered as 2-digit / always assume 20xx */
   if (DateValue.length == 6) {
      DateValue = DateValue.substr(0,4) + '20' + DateValue.substr(4,2); }
   if (DateValue.length != 8) {
      err = 19;}
   /* year is wrong if year = 0000 */
   year = DateValue.substr(4,4);
   if (year == 0) {
      err = 20;
   }
   /* Validation of month*/
   month = DateValue.substr(2,2);
   if ((month < 1) || (month > 12)) {
      err = 21;
   }
   /* Validation of day*/
   day = DateValue.substr(0,2);
   if (day < 1) {
     err = 22;
   }
   /* Validation leap-year / february / day */
   if ((year % 4 == 0) || (year % 100 == 0) || (year % 400 == 0)) {
      leap = 1;
   }
   if ((month == 2) && (leap == 1) && (day > 29)) {
      err = 23;
   }
   if ((month == 2) && (leap != 1) && (day > 28)) {
      err = 24;
   }
   /* Validation of other months */
   if ((day > 31) && ((month == "01") || (month == "03") || (month == "05") || (month == "07") || (month == "08") || (month == "10") || (month == "12"))) {
      err = 25;
   }
   if ((day > 30) && ((month == "04") || (month == "06") || (month == "09") || (month == "11"))) {
      err = 26;
   }
   /* if 00 ist entered, no error, deleting the entry */
   if ((day == 0) && (month == 0) && (year == 00)) {
      err = 0; day = ""; month = ""; year = ""; seperator = "";
   }
   /* if no error, write the completed date to Input-Field (e.g. 13.12.2001) */
   if (err == 0) {
      DateField.value = day + seperator + month + seperator + year;
   }
   /* Error-message if err != 0 */
   else {
       return false;
   }
  
return true; 
}
		
		
function ekontrol(isim){
        var validChars = "@.";
        var dirtyStr = String(isim)
	var bul = ""
        var len  = dirtyStr.length;
        for (var i = 0; i < len; i++)
			{  
            var chr = dirtyStr.charAt(i);
            if (validChars.indexOf(chr) > -1)
                   {
					bul = bul + "ok"
				   }
            }
         
         if (bul.substring(0,4) != "okok")
          {
                alert('E-posta Adi alaninda @ ve . karakteleri olmalidir')              
                return false;
		  }
		else
          {
                return true;
		  }
}



    
function harfkontrol(isim){
        var validChars = "@0123456789abcdefghijklmnopqrstuvwxyz.-_";
        var dirtyStr = String(isim)
        var len  = dirtyStr.length;
        for (var i = 0; i < len; i++){  
            var chr = dirtyStr.charAt(i);
            if (validChars.indexOf(chr) == -1){
                alert('E-posta Adi alaninda Turkce Karakter veya Buyuk HARF Kullanmayiniz!  Ornek = " ' + chr +' "' )
                return false;
            }
        }
        return true;
} 

function sayikontrol(isim){
        var validChars = "0123456789";
        var dirtyStr = String(isim)
        var len  = dirtyStr.length;
        for (var i = 0; i < len; i++){  
            var chr = dirtyStr.charAt(i);
            if (validChars.indexOf(chr) == -1){
                alert('Sayisal Alana Karakter Bilgi Girmeyiniz!' )
                return false;
            }
        }
        return true;
}