$(document).ready(function() {

  $('.subpic img').css("cursor", "pointer");

  $('.subpic img').click(function() {
	var newId = $(this).attr("id");
  	var newSrc = ("images/steps/" + newId + ".jpg");
    $('#mainpic img').attr('src', newSrc);
    // $('#mainpic a').attr('href', newSrc);
  });

  
});