JS Валящ сняг

Кода:

//Пътя до снежинката
var snowsrc="/prog/snow.gif" 
//var snowsrc="modules/mod_Christmas_snow/snow.gif"
// Configure below to change number of snow to render
var no = 15;
// След колко време да изчезват снежинките x секунди (0=never):
var hidesnowtime = 50;
// Колко снежинки да падат, преди да изчезнат ("windowheight" or "pageheight")
var snowdistance = "pageheight";

///////////Stop Config//////////////////////////////////

var ie4up = (document.all) ? 1 : 0;
var ns6up = (document.getElementById&&!document.all) ? 1 : 0;

function iecompattest(){
    return (document.compatMode && document.compatMode!="BackCompat")? document.documentElement : document.body
}

var dx, xp, yp;    // coordinate and position variables
var am, stx, sty;  // amplitude and step variables
var i, doc_width = 800, doc_height = 600; 

if (ns6up) {
    doc_width = self.innerWidth;
    doc_height = self.innerHeight;
} else if (ie4up) {
    doc_width = iecompattest().clientWidth;
    doc_height = iecompattest().clientHeight;
}

dx = new Array();
xp = new Array();
yp = new Array();
am = new Array();
stx = new Array();
sty = new Array();
snowsrc=(snowsrc.indexOf("iniciodirecto.com")!=-1)? "images/snow.gif" : snowsrc

for (i = 0; i < no; ++ i) {  
    dx[i] = 0;                        // set coordinate variables
    xp[i] = Math.random()*(doc_width-50);  // set position variables
    yp[i] = Math.random()*doc_height;
    am[i] = Math.random()*20;         // set amplitude variables
    stx[i] = 0.02 + Math.random()/10; // set step variables
    sty[i] = 0.7 + Math.random();     // set step variables
    if (ie4up||ns6up) {
        if (i == 0) {
            document.write("<div id=\"dot"+ i +"\" style=\"POSITION: absolute; Z-INDEX: "+ i +"; VISIBILITY: visible; TOP: 15px; LEFT: 15px;\"><a href=\"https://copaste.net\"><img src='"+snowsrc+"' border=\"0\"><\/a><\/div>");
        } else {
            document.write("<div id=\"dot"+ i +"\" style=\"POSITION: absolute; Z-INDEX: "+ i +"; VISIBILITY: visible; TOP: 15px; LEFT: 15px;\"><img src='"+snowsrc+"' border=\"0\"><\/div>");
        }
    }
}

function snowIE_NS6() {  // IE and NS6 main animation function
    doc_width = ns6up?window.innerWidth-10 : iecompattest().clientWidth-10;
    doc_height=(window.innerHeight && snowdistance=="windowheight")? window.innerHeight : (ie4up && snowdistance=="windowheight")?  iecompattest().clientHeight : (ie4up && !window.opera && snowdistance=="pageheight")? iecompattest().scrollHeight : iecompattest().offsetHeight;
    
    for (i = 0; i < no; ++ i) {  // iterate for every dot
        yp[i] += sty[i];
        if (yp[i] > doc_height-50) {
            xp[i] = Math.random()*(doc_width-am[i]-30);
            yp[i] = 0;
            stx[i] = 0.02 + Math.random()/10;
            sty[i] = 0.7 + Math.random();
        }
        dx[i] += stx[i];
        document.getElementById("dot"+i).style.top=yp[i]+"px";
        document.getElementById("dot"+i).style.left=xp[i] + am[i]*Math.sin(dx[i])+"px";  
    }
    
    snowtimer=setTimeout("snowIE_NS6()", 10);
}

function hidesnow(){
    if (window.snowtimer) clearTimeout(snowtimer) {
        for (i=0; i<no; i++) {
            document.getElementById("dot"+i).style.visibility="hidden"
        }
    }
}


if (ie4up||ns6up){
    snowIE_NS6();
    
    if (hidesnowtime>0) {
        setTimeout("hidesnow()", hidesnowtime*1000);
    }
}

Ето и снежинката [Цъкни]