var currentImg = 1; // Startbild
var timer = 8000; // Intervall für Autoumschaltung in ms
var numberOfImgs = 5; // Anzahl der Bilder und Thumbnails
var aktiv;

function init() {
	$("img.img-big").stop().css("opacity","1").hide();
	$("div.projektbeschreibung").stop().height('210px').hide();
}

function changeImg (param) {
	init();
	var imgtemp = "img#img"+param;
	var txttemp = "div#txt"+param;
	var previmg;
	var prevtxt;
	if (param>1) {
		previmg = "img#img"+(param-1);
		prevtxt = "div#txt"+(param-1);
	}
	else {
		previmg = "img#img"+numberOfImgs;
		prevtxt = "div#txt"+numberOfImgs;
	}
	$(prevtxt).slideUp(300, function() {
		$(previmg).fadeOut(300);
	});	
	$(imgtemp).fadeIn(500, function () {
		$(txttemp).fadeIn(2000);
	});
	currentImg = param;
}

function nextImg() {
	if (currentImg<numberOfImgs) {
		changeImg(++currentImg);
	}
	else {
		changeImg(1);
		currentImg=1;
	}
}

function startTimer() {
	aktiv = setInterval("nextImg()", timer);
}

function stopTimer() {
	clearInterval(aktiv);
}

$(document).ready(function(){
	$("img.img-tn").hover(
	  function () {
		stopTimer();
	  }, 
	  function () {
		startTimer();
	  }
	);
	for (var k=1; k<=numberOfImgs; k++) {
		$("div.thumbnails img:nth-child("+k+")").mouseover(new Function("changeImg("+k+");"));
	}
	var ua = navigator.userAgent;
	if(ua.indexOf("MSIE") >=0) {
		$('div.projektbeschreibung').css('filter', 'progid:DXImageTransform.Microsoft.Alpha(opacity=75)');
	}
	$("img.img-big").hide();
	init();
	$("#img"+currentImg).fadeIn(1000, function() {
		$("#txt"+currentImg).fadeIn(2000);
	});
	startTimer();
});