wind : 0,
maxXrange : 100,
minXrange : 10,
maxSpeed : 3,
minSpeed : 1,
color : "#fff",
char : "*",
maxSize : 25,
minSize : 10,

flakes : [],
WIDTH : 0,
HEIGHT : 0,

init : function(nb){
var o = this,
frag = document.createDocumentFragment();
o.getSize();

for(var i = 0; i < nb; i++){
var flake = {
x : o.random(o.WIDTH),
y : - o.maxSize,
xrange : o.minXrange + o.random(o.maxXrange - o.minXrange),
yspeed : o.minSpeed + o.random(o.maxSpeed - o.minSpeed, 100),
life : 0,
size : o.minSize + o.random(o.maxSize - o.minSize),
html : document.createElement("span")
};

flake.html.style.position = "absolute";
flake.html.style.top = flake.y + "px";
flake.html.style.left = flake.x + "px";
flake.html.style.fontSize = flake.size + "px";
flake.html.style.color = o.color;
flake.html.appendChild(document.createTextNode(o.char));

frag.appendChild(flake.html);
o.flakes.push(flake);
}

document.body.appendChild(frag);
o.animate();
window.onresize = function(){o.getSize();};
},

animate : function(){
var o = this;
for(var i = 0, c = o.flakes.length; i < c; i++){
var flake = o.flakes[i],
top = flake.y + flake.yspeed,
left = flake.x + Math.sin(flake.life) * flake.xrange + o.wind;
if(top < o.HEIGHT - flake.size - 10 && left 0){
flake.html.style.top = top + "px";
flake.html.style.left = left + "px";
flake.y = top;
flake.x += o.wind;
flake.life+= .01;
}
else {
flake.html.style.top = -o.maxSize + "px";
flake.x = o.random(o.WIDTH);
flake.y = -o.maxSize;
flake.html.style.left = flake.x + "px";
flake.life = 0;
}
}
setTimeout(function(){
o.animate();
},20);
},

random : function(range, num){
var num = num?num:1;
return Math.floor(Math.random() * (range + 1) * num) / num;
},

getSize : function(){
this.WIDTH = document.body.clientWidth || window.innerWidth;
this.HEIGHT = document.body.clientHeight || window.innerHeight;
}

};