var item = 1;
var lastitem = 0;
var nextitem = 0;
var anzahl = 0;
var backHTML = "";
var moreHTML = "";
var img = "";

function imgS(anzahl) {

    var nextitem = 2;
    var changedlink = document.getElementById('img' + nextitem).src;
    document.getElementById('imgzuruck').innerHTML = '<img src="App_Themes/arrow08.gif" alt="" /><span class="passive">zur&uuml;ck</span>';
    if(anzahl > 1) {
    document.getElementById('imgweiter').innerHTML = '<a href="javascript:;" onclick="changeBig(' + nextitem + ',' + anzahl + ');">weiter</a>';
    } else {
    document.getElementById('imgweiter').innerHTML = '<span class="passive">weiter</span><img src="App_Themes/arrow09.gif" alt="" />';
    }
    
}
 
function changeBig (item,anzahl) {

    var backHTML = "";
    var moreHTML = "";
    var nextitem = item + 1;
    var lastitem = item - 1;
    var img = document.getElementById('img' + item).src;

    document.getElementById('imgBig').src = img.replace("vorschau","normal");
    document.getElementById('imgBig').alt = document.getElementById("img" + item).alt;
    document.getElementById('imgBig').title = document.getElementById("img" + item).alt;
    document.getElementById('imgDesc').innerHTML = document.getElementById("img" + item).alt;
    document.getElementById('thisIMG').innerHTML = item;
    
	if(item == 1) {
            backHTML += '<img src="App_Themes/arrow08.gif" alt="" /><span class="passive">zur&uuml;ck</span>';
	} else {
			var changedlink = img;
			backHTML += '<a href="javascript:;" onclick="changeBig(' + lastitem + ',' + anzahl + ');">zur&uuml;ck</a>';
    }

	if(item == anzahl) {
			moreHTML += '<span class="passive">weiter</span><img src="App_Themes/arrow09.gif" alt="" />';
	} else {
			var changedlink = img;
            moreHTML += '<a href="javascript:;" onclick="changeBig(' + nextitem + ',' + anzahl + ');">weiter</a>';
    }

    document.getElementById('imgzuruck').innerHTML = backHTML;
	document.getElementById('imgweiter').innerHTML = moreHTML;
	
}