function check_form() {
		var email = document.kontakt.elements['adresmail'].value;
		var imie = document.kontakt.elements['imie'].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("Please, put your email address!.")
			document.kontakt.adresmail.focus();
			return;
			}
		else if (WzorE.test(email) == false){
			alert ("Please, put your correct email address!.")
			document.kontakt.adresmail.select();
			return;
		}
		else if ( !(imie.length > 0) ) {

			alert("Please, put your name!.")
			document.kontakt.imie.focus();
			return;
			}
		else if ( !(wiadomosc.length > 0) ) {

			alert("Please, put your comments!.")
			document.kontakt.wiadomosc.focus();
			return;
			}

		
		else {
			document.kontakt.submit();
			
  			}

	};