var prev_id = 1;

function switchPic(id) {
	if (prev_id != id) {
		$('effect').innerHTML = '<img src="img/wirkung'+id+'.jpg" alt="Wirkungsweise von Retterspitz &Auml;u&szlig;erlich" title="Wirkungsweise von Retterspitz &Auml;u&szlig;erlich" />';
		prev_id = id;
	}
}

function switchImg(id) {
	if (prev_id != id) {
		$('effect').innerHTML = '<img src="img/anwendung'+id+'.jpg" alt="Anwendung von Retterspitz &Auml;u&szlig;erlich" title="Anwendung von Retterspitz &Auml;u&szlig;erlich" />';
		prev_id = id;
	}
}

var values = new Array("Vorname", "Nachname", "E-Mail-Adresse*", "Postleitzahl", "Ihre Nachricht");

function setContent(field, id) {
	if (field.value == "") { 
		field.value = values[id];
		return null;
	}
	
	if (field.value == values[id]) { 
		field.value = "";
		return null;
	}
}

function checkForm() {
	var email = document.getElementById('mail').value.match(/\b(^(\S+@).+((\.com)|(\.net)|(\.edu)|(\.mil)|(\.gov)|(\.org)|(\..{2,2}))$)\b/gi);

	if ((!email) || (document.getElementById('mail').value == values[2])) {
		document.getElementById('mail').style.borderColor = "#FF0000";	
		alert("Bitte füllen Sie alle Pflichtfelder aus.");
	} else {
		document.contact.submit();
	}
}