Untitled

<!DOCTYPE>
<html lang="pl">
	<head>
	<meta charset="utf-8">
	<title>formularz</title>
	</head>
	<body>
	<form>
		podaj imie:<input type="text"><span ></span><br>
		podaj nazwisko:<input type="text"><span ></span><br>
		<input type="button" value="wyslij">
	</form>
		<script>
		function sprawdz(){
		var b_im='';
		var b_naz='';
		document.getElementsByTagName('span')[0]innerHTML= b_im;
		document.getElementsByTagName('span')[1]innerHTML= b_naz;
		document.getElementsByTagName('span')[2]innerHTML="";
		var im=document.getElementsByTagName('input')[0].value;
		var naz=document.getElementsByTagName('input')[0].value;
		wzorzec=/^[a-zA-Z]+$/;

		if(!wzorzec.test(im)){
			b_im="*blad imienia";
			document.getElementsByTagName('span')[0].innerHTML= b_im;
			return false;
			}
		if(!wzorzec.test(naz)){
			b_naz="*blad nazwiska";
			document.getElementsByTagName('span')[1].innerHTML= b_naz;
			return false;
		}
		document.getElementsByTagName('span')[2].innerHTML="ok";
		return true;
		}
		</script>
	</body>
</html>