If I understand the question, you should be able to create a variable in jQuery which is an array of all the string versions of your image urls that you want to use:
var images = ['../images/####','../images/$$$$', 'http://some.other/url.here];
// do this for as many images as you want to cycle through
Like that.
Then you can make a counter variable:
var counter = 0;
and set it to zero.
Next, add the event listener on() to your div like this:
$('#knapp').on('click', function(){
});
Finally, inside your event listener, change the CSS background-image property of the div to one of your images in the array:
// do this inside a document.ready() function
$('#knapp').on('click', function(){
$(this).css('background-image','url("' + images[counter] + '")');
counter++;
});
I hope this helped! Also, remember to increment counter
EDIT ----------------------------------------------------------------
OK, so I totally jumped over something obvious which is the fact that the counter might go too high and access something out of scope. To prevent this add the following inside of your on() listener:
if(counter >= images.length - 1){
counter = 0;
}
EDIT 2 --------------------------------------------------------------
Ok, so I didn't know what exactly you were asking at first, so here is my second answer. Since it seems like what you are actually trying to do is only switch the background image once on click, then you could use something like this:
$(document).ready(function(){
$('#knapp').on('click', function(){
$(this).css('background-image','url("YOUR_NEW_URL_HERE")');
});
});
or you could have it toggle between two images by making two identical classes in CSS (except for the background image) and replacing one with the other using .addClass and .removeClass.
EDIT 3---------------------------------------------------------------
I never thought I would edit this post this many times, but apparently I missed that the body background image should be changed (thanks to comments). My bad and thanks for pointing it out (even if you were talking to someone else).
