function sendMessage() {
	var name = document.contact_form.name.value;
	var email = document.contact_form.email.value;
	var message = document.contact_form.message.value;
	var capt = document.contact_form.capt.value;
	
	if (name == "" || email == "" || message == "" || capt == "") {
		alert ("Bitte füllen sie alle Felder aus, bevor sie die Nachricht abschicken.");	
		return;
	}
	if (!isEmail(email)) {
		alert("Die angegebene Email ist ungültig.");
		return;
	}
	document.contact_form.submit()
	
}

function isEmail(string) {
	if (string.search(/^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/) != -1)
		return true;
	else
		return false;
}