var cloudMoved = new Array();
$(init);
function init() {
	for(i = 1; i<=6; i++) {
		cloudMoved[i] = false;
		cloudMove(i);
	}
}

function cloudMove(whichone) {
	whichone = whichone || 1;
	if (!cloudMoved[whichone]) {
		$("#cloud" + whichone).css("left", $("#cloud" + whichone).offset().left)
	}
	var random1 = randomNumber();
	var random2 = randomNumber();
	$("#cloud" + whichone).animate({left: $("#sky").width()},
		cloudMoved[whichone] ? random1 : random2,
		"linear",
		function(){
			$(this).css("left", -parseInt($(this).css("width")))
			cloudMoved[whichone] = true;
			cloudMove(whichone);
		}
	)
}

function randomNumber() {
	return 20000;
}