function backHeight()
{
	if (document.all)
	{
	docHeight = document.all.main.offsetHeight-179;
	docImg = "<img src=\"../img/trans.gif\" width=\"133\" height=\""+ docHeight +"\" border=\"0\">";
    document.write(docImg);
	}
}

function backWidth()
{
	if (document.all)
	{
	docWidth = document.all.main.offsetWidth;
	frameWidth = (docWidth-910)/2;
	frameInsert = "<frameset cols=\""+ docWidth +",930\" FRAMESPACING=\"0\" MARGINHEIGHT=\"0\" MARGINwidth=\"0\" BORDER=\"0\" FRAMEBORDER=\"0\">"

    document.write(frameInsert);
	}
}

function popup(url)
{
	var winl = (screen.width - 560) / 2;
	var wint = (screen.height - 455) / 2;
	hauptfenster = window.open(url,"HauptFenster",'top='+wint+',left='+winl+',toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=no,copyhistory=no,width=576,height=455');
	hauptfenster.focus();
}

function popup_portfolio(url)
{
	var winl = (screen.width - 1024) / 2;
	var wint = (screen.height - 840) / 2;
	portfolio = window.open(url,"PortfolioFenster",'top='+wint+',left='+winl+',toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=no,copyhistory=no,width=1024,height=850');
	portfolio.focus();
}

function senden()
{
	if((document.form.name.value == "") || (document.form.betreff.value == "") || (document.form.email.value == "") || (document.form.telefon.value == ""))
  {
		alert("Bitte füllen sie alle Pflichtfelder aus!");
		return false;
	}
	else if((document.form.email.value == "") || (document.form.email.value.indexOf('@') == -1) || (document.form.email.value.indexOf('.') == -1) || (document.form.email.value.indexOf('?') != -1) || (document.form.email.value.indexOf(' ') != -1)) {
		alert("Bitte geben Sie eine korrekte E-Mail ein!");
   return false;
  }
	else
	{
		document.form.submit();
	}
}