javascript - Find index in array different from the array that loaded -

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line 35, before alert, returns -1. tried $(this).index() same result. here should do: clicking en.gif should return 4, grand_array_pics[4] should give me en_array_pics , load .gifs in array.

$(document).ready(function () {      var main_pics = ["an.gif", "bn.gif", "cn.gif", "dn.gif", "en.gif", "gn.gif"];      var starting_pics = ["an.gif", "cn.gif", "en.gif"];      var an_array_pics = ["bn.gif", "en.gif", "gn.gif", "an.gif","dn.gif"];     var bn_array_pics = ["cn.gif", "dn.gif", "gn.gif"];     var cn_array_pics = ["dn.gif", "gn.gif", "an.gif", "cn.gif"];     var dn_array_pics = ["en.gif", "an.gif", "cn.gif"];     var en_array_pics = ["gn.gif", "an.gif", "cn.gif", "en.gif"];     var gn_array_pics = ["an.gif", "cn.gif", "en.gif", "gn.gif"];      var grand_array_pics = [         an_array_pics,         bn_array_pics,         cn_array_pics,         dn_array_pics,         en_array_pics,         gn_array_pics     ];      var = 0;      (i = 0; < starting_pics.length; i++) {         $("<img/>").attr("src", "images/" + starting_pics[i]).load(function () {             $(this).appendto("#main");             $(this).addclass("pics");         });     }      $("#main").on("click", ".pics", function () {          var j = $.inarray(this, main_pics);         alert(j);          $("#sidebar .pics").remove();         $(this).clone().appendto("#train");         $(this).clone().appendto("#sidebar");         $("#main .pics").remove();          var chosen_pics_array = grand_array_pics[j];         var count = chosen_pics_array.length;          var k = 0;          (k = 0; k < count; k++) {             $("<img/>").attr("src", "images/" + chosen_pics_array[k]).load(function () {                 $(this).appendto("#main");                 $(this).addclass("pics");             });         }     }); });       //end ready

this dom <img> element, while main_pics array of strings. never found inside there. use

var j = $.inarray(this.src.split("/").pop(), main_pics);

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