Change image randomly when hover

i want to change an image randomly when hovering. The Hover effect is working but when the mouse moves out the image does not change back. Any ideas?

var arr = ["020", "053", "306", "035", "930"];

function getRandomImage() {
  var index = Math.floor(Math.random() * arr.length);

  return arr[index];

}

$(function(){
$(".size-woocommerce_thumbnail").hover(function(){
    var image = getRandomImage();
    $(this).attr("srcset", function(index, attr){
        return attr.replace("070", image);
    });
    $(this).attr("src", function(index, attr){
        return attr.replace("070", image);
    });
}, function(){
    $(this).attr("srcset", function(index, attr){
        return attr.replace(image, "070");
    });
    $(this).attr("src", function(index, attr){
        return attr.replace(image, "070");
    });
});
});