Figures as soon as I posted this I figured it out.  Just in case someone else is looking to do this, here is the javascript code.  Just make sure to update the "file path to image 1" and so on with the actual image paths

$(document).ready(function(){
var images=['File Path to Image 1',
            'file path to image 2',
            'file path to image 3',
            ];

var randomNumber = Math.floor(Math.random() * images.length);
var bgImg = 'url(' + images[randomNumber] + ')';

$('body').css({'background':bgImg, 'background-size':'cover','background-position':'center',
              'background-attachment':'fixed', 'background-repeat':'no-repeat',  });

});