function trim(s) {
	while (s.substring(0,1) == ' ') {
		s = s.substring(1,s.length);
	}
	while (s.substring(s.length-1,s.length) == ' ') {
		s = s.substring(0,s.length-1);
	}
  
	return s;
}

function checkForm(form) {
	formobj = document.getElementById(form);
	alerttxt = "";
	
	if (form == "kontakt") {
		if (trim(formobj.email.value) == "") {
			alerttxt += "- Ihre E-Mail-Adresse\n";
		}		
		if (trim(formobj.anfrage.value) == "") {
			alerttxt += "- Ihre Anfrage\n";
		}
	}
	
	if (form == "downloads") {
		if (trim(formobj.firma.value) == "") {
			alerttxt += "- Ihr Firmenname\n";
		}	
		if (trim(formobj.ansprechpartner.value) == "") {
			alerttxt += "- Unseren Ansprechpartner\n";
		}	
		if (trim(formobj.strasse.value) == "") {
			alerttxt += "- Ihre Strasse\n";
		}	
		if (trim(formobj.plz.value) == "") {
			alerttxt += "- Ihre Postleitzahl\n";
		}	
		if (trim(formobj.ort.value) == "") {
			alerttxt += "- Ihren Ort\n";
		}	
		if (trim(formobj.telefon.value) == "") {
			alerttxt += "- Ihre Telefonnummer\n";
		}
		if (trim(formobj.email.value) == "") {
			alerttxt += "- Ihre E-Mail-Adresse\n";
		}
	}
			
	if (alerttxt != "") {
		alert("Bitte geben Sie uns noch folgende Informationen:\n\n" + alerttxt);
	} else {
		formobj.submit();
	}
}

function reloadKontakt() {
	formobj = document.getElementById("kontaktform");
	kontakt_id = formobj.kontakt_id.options[formobj.kontakt_id.selectedIndex].value;
	location.href = "index.php?action=kontakt&kontakt_id=" + kontakt_id;
}

function popup(imagetoopen) {
	window.open('popup.php?file='+imagetoopen, 'popup', 'width=500,height=331');
}