css - jquery hide DIVs, change background then when the images loaded show the divs -

i want change background image of divs, when hidden, , when loaded show divs.

$('.answerbox').hide("slow", function() {             changetext();             $(this).filter(".show").show("slow");//do after images loaded         }); 

here full code: http://jsfiddle.net/bergkamp/karx7/

and can show div in same time together?