function pass() {
			if (document.forms.contact_form.first_name.value == "" || document.forms.contact_form.surname.value == "" || document.forms.contact_form.mail.value == "" || document.forms.contact_form.re_mail.value == "" || document.forms.contact_form.phone.value == "") {
			alert("Please fill * correctly!");
			}
			else if (document.forms.contact_form.mail.value.indexOf("@") == -1 || document.forms.contact_form.mail.value.indexOf(".") == -1 || document.forms.contact_form.mail.value.length < 6) {
			alert("Please check your E-mail address!");
			}
			else if (document.forms.contact_form.mail.value != document.forms.contact_form.re_mail.value) {
			alert("E-mails are different! Please check!");
			} else {
				document.forms.contact_form.submit();
			}
		}