var klein_1 = new Image();
var klein_2 = new Image();
var klein_3 = new Image();


klein_1.src = "images/back_start_2.jpg";
klein_2.src = "images/back_start_3.jpg";
klein_3.src = "images/back_start.jpg";




function Zeigen(Bildname)
{
eval("document['pic_back'].src = " + Bildname + ".src");
}