function check_form() {

		var email = document.kontakt.elements['email'].value;
		var tytul = document.kontakt.elements['tytul'].value;
		var wiadomosc = document.kontakt.elements['tresc'].value;
		var WzorI=/^[A-Za-z]/;
		var WzorE=/^[0-9a-zA-Z.-_]+\@[0-9a-zA-Z.-_]+\.[0-9a-zA-Z.]{2,3}$/;

			if ( !(email.length > 0) ) {

			alert("Field Email address is empty!\nPlease fill it!")
			document.kontakt.email.focus();
			return;
			}
		else if (WzorE.test(email) == false){
			alert ("Bad format of Email address field!\nPlease correct it!")
			document.kontakt.email.select();
			return;
		}
		else if ( !(tytul.length > 0) ) {

			alert("Field Subject is empty!\nPlease fill it!")
			document.kontakt.tytul.focus();
			return;
			}
		else if ( !(wiadomosc.length > 0) ) {

			alert("Field Comments is empty!\nPlease fill it!")
			document.kontakt.wiadomosc.focus();
			return;
			}

		
		else {
		
			document.kontakt.submit();
			
  			}

	};