Silvester Feuerwerk Animation

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<script type='text/javascript'>
<!--
var no = 18; // Anzahl der Schneeflocken
var speed = 25; // Geschwindigkeit -> je kleiner die Zahl, desto schneller
var snowflake = "snow.gif";

var dx, xp, yp; // coordinate and position variables
var am, stx, sty; // amplitude and step variables
var i, doc_width, doc_height;
doc_width = document.body.clientWidth;
doc_height = 1100;

dx = new Array();
xp = new Array();
yp = new Array();
am = new Array();
stx = new Array();
sty = new Array();
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 (i == 0) {
document.write("<div id=\"schneedot"+ i +"\" style=\"position: ");
document.write("absolute; z-index: "+ i +"; visibility: ");
document.write("visible; top: 15px; left: 15px;\"><img src=\"");
document.write(snowflake + "\" border=\"0\"></div>");
} else {
document.write("<div id=\"schneedot"+ i +"\" style=\"position: ");
document.write("absolute; z-index: "+ i +"; visibility: ");
document.write("visible; top: 15px; left: 15px;\"><img src=\"");
document.write(snowflake + "\" border=\"0\"></div>");
}
}
function snowIE() { // IE main animation function
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("schneedot"+i).style.top = yp[i] + "px";
document.getElementById("schneedot"+i).style.left = (xp[i] + am[i]*Math.sin(dx[i])) + "px";
}
setTimeout("snowIE()", speed);
}
//-->
</script>
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