var ImageSwitch = {
  norm: "./images/personalPage-norm.png",
  look: "./images/personalPage-look.png",
  init: function() {
    setTimeout("ImageSwitch.changer()", 5000);
    $("#backstretch img").attr("src", ImageSwitch.norm);
  },
  changer: function() {
    setTimeout("ImageSwitch.init()", 250);
    var look = "./images/personalPage-look.png";
    $("#backstretch img")
      .attr("src", ImageSwitch.look);
  }
};

$.backstretch("./images/personalPage-norm.png", {speed: 1000});

ImageSwitch.init();