Array.prototype.rand = function(){
				for(var i=0; i<this.length; i++){
					var val = Math.floor(Math.random() * this.length);
					var temp = this[i];
					this[i] = this[val];
					this[val] = temp;
					
				}
			}

image.rand();

var num = Math.random();
var ran = Math.floor((image.length - 1) * num);

var index = 0;

meinBild.src = "./neue/Adresse/des/Bildes.png";

image[index]

function erhoehe(){
  index++;
  index=index>=image.length?0:index;
}