(function($){
    $.fn.snow=function(options){
        var $flake=$('<div />')
            .css({
                'position':'fixed',//'absolute',
                'top':'-50px',
                'z-index':'1000'
                })
            .html('&#10052;');
        var documentHeight=document.documentElement.clientHeight;//$(document).height();
        var documentWidth=$(document).width();
        var defaults={minSize:10,maxSize:20,newOn:500,flakeColor:"#FFFFFF"};
        var options=$.extend({},defaults,options);
        var interval=setInterval(function(){
            var startPositionLeft=Math.random()*documentWidth-100;
            var startOpacity=0.5+Math.random();
            var sizeFlake=options.minSize+Math.random()*options.maxSize;
            var endPositionTop=documentHeight-40;
            var endPositionLeft=startPositionLeft-100+Math.random()*200;
            var durationFall=documentHeight*10+Math.random()*5000;
            $flake.clone()
                  .appendTo('body')
                  .css({
                        left:startPositionLeft,
                        opacity:startOpacity,
                        'font-size':sizeFlake,
                        color:options.flakeColor
                      })
                  .animate({
                            top:endPositionTop,
                            left:endPositionLeft,
                            opacity:0.2
                        },
                        durationFall,
                        'linear',
                        function(){
                            $(this).remove();
                        });
        },options.newOn);//interval End
    };//$.fn.snow End
})(jQuery); 

$.fn.snow({ minSize: 10, maxSize: 60, newOn: 800, flakeColor: '#ccc'});