bookmarklet

//Executed through a self-invoking anonymous function

(function(){

  //declare the variables that we will need
  var imgName = "10584590_588581994607732_199003263_n.jpg";
  var uriA = "http://photos-e.ak.instagram.com/hphotos-ak-xfa1/10584590_588581994607732_199003263_n.jpg";
  var uri1 = "http://instagram.com/p/sLLSiTCXB5/?modal=true";
  var uri2 = "http://instagram.com/p/sLLSiTCXB5/";

//build the logic 
  if (document.URL === uri1) {
    window.open(uriA, "_self");
  } else if
    (document.URL === uri2) {
      window.open(uriA, "_self");
  } else {
    alert ("Sorry The image isn't here!");
  }
})();

// I didn't know how to add logic to traverse the DOM and make the Image clickable.
// Started to look at that, but got lost in a spiral of Stackoverflow threads.
// document.getElementsByName(imgName===uriA);