Randomise a group of divs

randomise

$(document).ready(function() {
	
	$('.rdm').hide();

	var elements = $('.rdm');
	var elementCount = elements.size();
	var elementsToShow = 5;
	var alreadyChoosen = ",";
	var i = 0;
    	while (i < elementsToShow) {
        	var rand = Math.floor(Math.random() * elementCount);
        		if (alreadyChoosen.indexOf("," + rand + ",") < 0) {
            		alreadyChoosen += rand + ",";
            		elements.eq(rand).show();
            	++i;
        	}
    	}
	
});