function CalcKeyCode(aChar) 
	{
 		 var karekter = aChar.substring(0,1);
 		 var code = aChar.charCodeAt(0);
  		return code;
	}
function numara_kontrolu(val) 
	{
		var strPass = val.value;
		var strLength = strPass.length;
		var lchar = val.value.charAt((strLength) - 1);
		var cCode = CalcKeyCode(lchar);
		if (cCode < 45 || cCode > 57 ) 
			{
				var myNumber = val.value.substring(0, (strLength) - 1);
				val.value = myNumber;
			}
  		return false;
	}