iterate focus with keyboard arrows on images in different div’s

iterate focus with keyboard arrows on images in different div’s

hi all,
i want to be able to move focus on images   that has the same class,  with the keyboard arrows (in a thumbnail scroller).
this is what i have:
  html:
<div class = "swiper-wrapper" id= "swiper-wrapper" > <div class = "swiper-slide" tabindex= "0" ><img src= "cards/jpeg1.jpg" alt= "" class = "thumb" ></div> <div class = "swiper-slide" tabindex= "-1" ><img src= "cards/jpeg2.jpg" alt= "" class = "thumb" ></div> </div>
jquery:
var parent = document .getElementById( "swiper-wrapper" ); var children = document .getElementById( "swiper-wrapper" ).children; for ( var i = 0 ; i < children.length; i++) { $( '.swiper-slide, select' ).keydown( function (e) { if (e.keyCode == 39 ) { $( this ).next( '.swiper-slide , select' ).focus(); } else if (e.keyCode == 37 ) { $( this ).prev( '.swiper-slide , select' ).focus(); } }) }
this gives me keyboard control focus only on the div's containing the images.
how do i improve it to move the focus between the actual images?