// pictures.js
function switchTopic( topic, count )
{
    first = topic;
	maxFirst = count;
	Bild = new Array();
	for( var i = 0; i < maxFirst; i++ )
	{
		Bild[i] = new Image(); Bild[i].src = prefix + first + (i+1) + end;
	}
	SEITE_init();
}

function blaettern(Richtung) {
 zeige = zeige + Richtung;
 if(zeige > Bild.length - 1) zeige = 0;
 else if(zeige < 0) zeige = Bild.length - 1;
 if(DOM || MSIE4)
   getElement("id","Bildbereich",null).style.clip="rect(0 0 500 0)";
 if(DOM && !MSIE4 && !OP) {
   var img = document.createElement("img");
   var src = document.createAttribute("src");
   src.nodeValue = Bild[zeige].src;
   img.setAttributeNode(src);
   var replElem = getElement("id","Bildbereich",null);
   replElem.replaceChild(img, replElem.firstChild);
   var last = getElement("id","Bildbereich",null).lastChild;
   var length = getElement("id","Bildbereich",null).childNodes.length;
   if( last != null && length > 1)
   {
       getElement("id","Bildbereich",null).removeChild(last);
   }
 }
 else if(MSIE4) {
   document.all.Bildbereich.innerHTML = "<img src=\"" + Bild[zeige].src + "\">";
 }
 else if(NS4) {
   getElem("index",0,null).visibility = "hide";
   setCont("index",0,null,"<img src=\"" + Bild[zeige].src + "\">");
   getElem("index",0,null).clip.right = 0;
   getElem("index",0,null).visibility = "show";
 }
 getXMLHttp(first+"_"+(zeige+1)+".inc.php");
}

function SEITE_init() {
 if(navigator.appVersion.indexOf("MSIE")>-1){hoverIE();}		
 if(DOM && !MSIE4 && !OP) {
   img = document.createElement("img");
   var src = document.createAttribute("src");
   src.nodeValue = Bild[0].src;
   img.setAttributeNode(src);
   var replElem = getElement("id","Bildbereich",null);
   replElem.replaceChild(img, replElem.firstChild);
   var last = getElement("id","Bildbereich",null).lastChild;
   var length = getElement("id","Bildbereich",null).childNodes.length;
   if( last != null && length > 1)
   {
       getElement("id","Bildbereich",null).removeChild(last);
   }
 }
 else if(document.all)
   document.all.Bildbereich.innerHTML = "<img src=\"" + Bild[0].src + "\">";
 else if(NS4)
   setCont("index",0,null,"<img src=\"" + Bild[0].src + "\">");
 getXMLHttp(first+"_"+(zeige+1)+".inc.php");
}

function getXMLHttp(file){
	var xmlHttp = null;
	// Mozilla, Opera, Safari sowie Internet Explorer 7
	if (typeof XMLHttpRequest != 'undefined') {
	    xmlHttp = new XMLHttpRequest();
	}
	if (!xmlHttp) {
	    // Internet Explorer 6 und älter
	    try {
	        xmlHttp  = new ActiveXObject("Msxml2.XMLHTTP");
	    } catch(e) {
	        try {
	            xmlHttp  = new ActiveXObject("Microsoft.XMLHTTP");
	        } catch(e) {
	            xmlHttp  = null;
	        }
	    }
	}
	if (xmlHttp) {
		var response = "";
	    xmlHttp.open('GET', file, true);
	    xmlHttp.onreadystatechange = function () {
	        	if (xmlHttp.readyState == 4 && xmlHttp.status == 200) {
	        		response = xmlHttp.responseText;
	        	}
				if(MSIE4) {
				   document.all.comments.innerHTML = response;
				} else {
          				getElement("id","comments",null).innerHTML = response;
       			}
	    };
	    xmlHttp.send(null);
	}
}