// Cloud Float...
var $main = $cloud = mainwidth = null;
var offset1 = 850;
var offsetbg = 0;

$(document).ready(
	function () {
		$main = $("#cloudbig");
		$body = $("body");
		mainwidth = $main.outerWidth();  
	}
);

/// 飘动
setInterval(function flutter() {
	if (offset1 >= mainwidth) {
		offset1 =  -100;
	}
	offset1 += 1.1;
	$("#cloud1").css("background-position", offset1 + "0px -30px")
}, 60);