var setOfRandomClassNames = new Array("bgimage-set01-one", "bgimage-set01-two", "bgimage-set01-three", "bgimage-set01-four", "bgimage-set01-five", "bgimage-set01-six", "bgimage-set01-seven", "bgimage-set01-eight", "bgimage-set01-nine", "bgimage-set01-ten");

var queryForElementsToAddRandomClassTo = "body"; 

 $(document).ready(function(){$(queryForElementsToAddRandomClassTo).addRandomClass(setOfRandomClassNames);});