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KissManga Scripts (Next/Prev Chapter & Resize Image)

Combines both my scripts for kissmanga so that they can both be used.

// ==UserScript==
// @name KissManga Scripts (Next/Prev Chapter & Resize Image)
// @author Ew0345
// @namespace ew0345
// @description Combines both my scripts for kissmanga so that they can both be used.
// @version 1.0
// @homepage https://youtube.com/user/ew0345
// @include *://kissmanga.com/Manga/*/*
// @grant none
// ==/UserScript==

var c = [$('a:contains("Next chapter")'), $('a:contains("Previous")')];

//console.log('loaded\n'+c[0].attr('href')+'\n'+c[1].attr('href'));
let img = ['#divImage img'];
let wper = 100;

function setImageWidth() {
  const inp = prompt('Image Width % (Do not include % sign)');
  wper = inp.valueOf();
  
  for (let i = 0; i < document.querySelectorAll(img).length; i++) {
    document.querySelectorAll(img)[i].style.width = wper+'%';
  }
}

window.onkeydown = function (o) {
  switch(o.keyCode) {
    case 37: 
      if (/*c[1].length*/ $('a:contains("Previous")').length > 0) {
          document.location = $('a:contains("Previous")').attr('href'); //$(c[1]).attr('href');
      } else {
        console.log('Either no previous chapter or not on All Pages mode');
      }
      break;
    case 39: 
      if (c[0].length /*$('a:contains("Next Chapter")').length*/ > 0) {
        document.location = /*$('a:contains("Next chapter")').attr('href');*/ $(c[0]).attr('href');
      } else {
        console.log('Either no next chapter or not on All Pages mode');
      }
      break;
    case 38: setImageWidth();
      break;
    default: break;
  }
};