this.randombanner = function(){
	var number = parseInt($('.randombanner').length);
	for (i = 0; i < number; i++){ 
	var length = $(".randombanner:eq(" + i + ") li").length;
	var ran = Math.floor(Math.random()*length) + 1;
	
	$(".randombanner:eq(" + i + ") li").hide();
	$(".randombanner:eq(" + i + ") li:nth-child(" + ran + ")").show();
	} 
};

$(document).ready(function(){	
	randombanner();
});