function checkForm() {

  if(document.getElementById('name').value == ""){
	alert('Bitte geben Sie Ihren Namen ein!');
	return false;
  }
  
  /*if(document.getElementById('telefon').value == ""){
	alert('Bitte geben Sie Ihre Telefonnummer ein!');
	return false;
  }*/
  
  if(document.getElementById('email').value == ""){
	alert('Bitte geben Sie Ihre E-Mailadresse ein!');
	return false;
  }
  
  
  
}
function validEmail(email) {
  var strReg = "^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$";
  var regex = new RegExp(strReg);
  return(regex.test(email));
}

function changer(nr)
{
	
	//Seite 1
	if (nr=='00-a')	{	document.pic0.src="images/referenzen/small/0-0-akt.jpg"; }
	if (nr=='00-d')	{	document.pic0.src="images/referenzen/small/0-0.jpg"; }
	if (nr=='01-a')	{	document.pic1.src="images/referenzen/small/0-1-akt.jpg"; }
	if (nr=='01-d')	{	document.pic1.src="images/referenzen/small/0-1.jpg"; }
	if (nr=='02-a')	{	document.pic2.src="images/referenzen/small/0-2-akt.jpg"; }
	if (nr=='02-d')	{	document.pic2.src="images/referenzen/small/0-2.jpg"; }
	if (nr=='03-a')	{	document.pic3.src="images/referenzen/small/0-3-akt.jpg"; }
	if (nr=='03-d')	{	document.pic3.src="images/referenzen/small/0-3.jpg"; }
	
	//Seite 2
	if (nr=='10-a')	{	document.pic0.src="images/referenzen/small/1-0-akt.jpg"; }
	if (nr=='10-d')	{	document.pic0.src="images/referenzen/small/1-0.jpg"; }
	if (nr=='11-a')	{	document.pic1.src="images/referenzen/small/1-1-akt.jpg"; }
	if (nr=='11-d')	{	document.pic1.src="images/referenzen/small/1-1.jpg"; }
	if (nr=='12-a')	{	document.pic2.src="images/referenzen/small/1-2-akt.jpg"; }
	if (nr=='12-d')	{	document.pic2.src="images/referenzen/small/1-2.jpg"; }
	if (nr=='13-a')	{	document.pic3.src="images/referenzen/small/1-3-akt.jpg"; }
	if (nr=='13-d')	{	document.pic3.src="images/referenzen/small/1-3.jpg"; }
	
	//Seite 3
	if (nr=='20-a')	{	document.pic0.src="images/referenzen/small/2-0-akt.jpg"; }
	if (nr=='20-d')	{	document.pic0.src="images/referenzen/small/2-0.jpg"; }
	if (nr=='21-a')	{	document.pic1.src="images/referenzen/small/2-1-akt.jpg"; }
	if (nr=='21-d')	{	document.pic1.src="images/referenzen/small/2-1.jpg"; }
	if (nr=='22-a')	{	document.pic2.src="images/referenzen/small/2-2-akt.jpg"; }
	if (nr=='22-d')	{	document.pic2.src="images/referenzen/small/2-2.jpg"; }
	if (nr=='23-a')	{	document.pic3.src="images/referenzen/small/2-3-akt.jpg"; }
	if (nr=='23-d')	{	document.pic3.src="images/referenzen/small/2-3.jpg"; }
	
	//Seite 4
	if (nr=='30-a')	{	document.pic0.src="images/referenzen/small/3-0-akt.jpg"; }
	if (nr=='30-d')	{	document.pic0.src="images/referenzen/small/3-0.jpg"; }
	if (nr=='31-a')	{	document.pic1.src="images/referenzen/small/3-1-akt.jpg"; }
	if (nr=='31-d')	{	document.pic1.src="images/referenzen/small/3-1.jpg"; }
	if (nr=='32-a')	{	document.pic2.src="images/referenzen/small/3-2-akt.jpg"; }
	if (nr=='32-d')	{	document.pic2.src="images/referenzen/small/3-2.jpg"; }
	if (nr=='33-a')	{	document.pic3.src="images/referenzen/small/3-3-akt.jpg"; }
	if (nr=='33-d')	{	document.pic3.src="images/referenzen/small/3-3.jpg"; }
}