function besar(obj) {
  obj.value = obj.value.toUpperCase();
}
function kecil(obj) {
  obj.value = obj.value.toLowerCase()();
}
function angka(e, decimal) {
	var key;
	var keychar;
	
	if (window.event) {
	   key = window.event.keyCode;
	}
	else if (e) {
	   key = e.which;
	}
	else {
	   return true;
	}
	keychar = String.fromCharCode(key);
	
	if ((key==null) || (key==0) || (key==8) ||  (key==9) || (key==13) || (key==27) ) {
	   return true;
	}
	else if ((("0123456789").indexOf(keychar) > -1)) {
	   return true;
	}
	else if (decimal && (keychar == ".")) { 
	  return true;
	}
	else
	   return false;
}
function koma(number) {
//number = '' + number.replace(",","") + '';
//var str="Visit Microsoft!";
//document.write(str.replace("Microsoft","W3Schools"));

number = '' + number;
if (number.length > 3) {
	var mod = number.length % 3;
	var output = (mod > 0 ? (number.substring(0,mod)) : '');
		for (i=0 ; i < Math.floor(number.length / 3); i++) {
			if ((mod == 0) && (i == 0))
			output += number.substring(mod+ 3 * i, mod + 3 * i + 3);
		else
			output+= '.' + number.substring(mod + 3 * i, mod + 3 * i + 3);
		}
	return (output);
	}
	else return number;
}