// by vollprecht gestaltung 
var curr;

$('document').ready(function() {
	$("img.sky").css("display", "none");  
	changeBanner();
});

function changeBanner() {
    var next=curr;
    while (next==curr){
        var next = Math.floor(Math.random()*($("img.sky").length)); 
    } 
    $("img.sky").eq(curr).fadeOut("100");  
    $("img.sky").eq(next).fadeIn("100"); 
    curr = next;
    setTimeout(function(){changeBanner();}, 4000);
}