var gImgIndex = 1;
var gMaxImages = 10;
var gIndex = 3;

function skip()
{
	aimg = document.getElementById('ausstellungsbild');
	// für ie
	document.getElementById('inhalt').style.overflow = 'hidden';
	gImgIndex+=arguments[0];
	if(gImgIndex > gMaxImages) gImgIndex = 1;
	if(gImgIndex <= 0) gImgIndex = gMaxImages;
	newimg = 'ausstellung/img_zona_'+gImgIndex+'.jpg';


	divl = document.getElementById('laden');
	divl.style.display = 'block';
	//divl.firstChild.nodeValue = gImgIndex;

	loadimg = new Image();
	loadimg.onload = function()
	{
		divl.style.display = 'none';
		aimg.src = this.src;
	}
	loadimg.src = newimg;
}


function checkform() {
	if(window.document.forms[0].form_vorname.value == "") {
		alert("Bitte Vorname eingeben.");
		window.document.forms[0].form_vorname.focus();
		return false;
	}

	if(window.document.forms[0].form_nachname.value == "") {
		alert("Bitte Nachname eingeben.");
		window.document.forms[0].form_nachname.focus();
		return false;
	}

	if(window.document.forms[0].form_strasse.value == "") {
		alert("Bitte Adresse eingeben.");
		window.document.forms[0].form_strasse.focus();
		return false;
	}

	if(window.document.forms[0].form_plz.value == "") {
		alert("Bitte Postleitzahl eingeben.");
		window.document.forms[0].form_plz.focus();
		return false;
	}

	if(window.document.forms[0].form_ort.value == "") {
		alert("Bitte Ort eingeben.");
		window.document.forms[0].form_ort.focus();
		return false;
	}
}

function csseinbinden() {
	// ie auf mac
	if(navigator.appName.indexOf("Internet") != -1 & navigator.platform.indexOf("Win") == -1) {
		//alert("ie auf mac");
		document.write("<link rel = \"stylesheet\" type = \"text/css\" href = \"macie.inc.css\">");
	} else {
		// ie auf win
		if(navigator.appName.indexOf("Internet") != -1 & navigator.platform.indexOf("Win") != -1) {
			//alert("ie auf win");
			document.write("<link rel = \"stylesheet\" type = \"text/css\" href = \"winie.inc.css\">");
		} else {
			// netscape
			//alert("netscape");
			document.write("<link rel = \"stylesheet\" type = \"text/css\" href = \"netscape.inc.css\">");
		}
	}
}


		/**** Preload Bilder ****/
		// var bilder = new Array();
		/*
		function preloadimages() {
			for (i=0;i<preloadimages.arguments.length;i++) {
				bilder[i] = new Image();
				bilder[i].src = "bilder/" + preloadimages.arguments[i];
			}
		}
		*/

		/**** Bildanimation auf Home ****/
		var zeit;
		zeit = 5000;

		/*
		var ok = 0;
		var img = new Array();

		function laden(wo) {
			var zeit;
			zeit = 5000;

			var img = new Array();
			//alert(wo);
			for(i=0; i<9; i++) {
				img[i] = new Image();
				var quelle = "bilder/zona" + i + ".gif";
				img[i].src = quelle;
				img[i].onload = function() {
					ok++;
					if(ok == 8) start(wo);
				}
			}
		}
		*/


		function wechseln(wo) {

			// if(window.name == '')
				// window.name = wo;
			//bild = document.getElementById("zelle").style.backgroundImage;
			// if(bild == "")
				// index = wo;
			// else
				// index = bild.substr(bild.length -6, 1);		// index = bild.substring(bild.length - 6, bild.length - 5);
			//index = window.name;
			//console.log(index);
			gIndex++;
			if(gIndex > 8) gIndex = 3;
			neuesbild = "url(bilder/zona" + gIndex + ".gif)";

			document.getElementById("zelle").style.backgroundImage = neuesbild;
			// window.name = index;
		}


		function start(wo) {
			setInterval("wechseln(" + wo + ")", zeit);
		}