var no = 30; // Anzahl der Schneeflocken
var speed = 50; // 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 = 1024;//document.body.clientWidth;  //1024;
doc_height = screen.availHeight-50; 

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;//(document.body.clientWidth / 2) - 512;//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);

}

snowIE();