dalende snefnug

Jeg sidder her med et javascript, det virker og det hele, meeen der er lidt noget jeg gerne vil gøre bedre, men jeg kan ikke helt finde ud af det.
Scriptet er snefnug som daler ned over min hjemmeside, men ikke hele vejen ned. Mit spørgsmål er så, som følgende. Hvordan får jeg mine snefnug til og dale hele vejen ned på min hjemmeside ???

Her er scriptet:

<script language="JavaScript1.2">

    var no = 50; // snow number
    var speed = 0; // smaller number moves the snow faster
    var snowflake = "snow.gif";

    var ns4up = (document.layers) ? 1 : 0;  // browser sniffer
    var ie4up = (document.all) ? 1 : 0;
    var dx, xp, yp;    // coordinate and position variables
    var am, stx, sty;  // amplitude and step variables
    var i, doc_width = 1024, doc_height = 768;
    if (ns4up) {
    doc_width = self.innerWidth;
    doc_height = self.innerHeight;
    } else if (ie4up) {
    doc_width = document.body.clientWidth;
    doc_height = document.body.clientHeight;
    }
    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 (ns4up) {                      // set layers
    if (i == 0) {
    document.write("<layer name=\"dot"+ i +"\" left=\"15\" ");
    document.write("top=\"99\" visibility=\"show\"><img src=\"");
    document.write(snowflake + "\" border=\"0\"></layer>");
    } else {
    document.write("<layer name=\"dot"+ i +"\" left=\"15\" ");
    document.write("top=\"99\" visibility=\"show\"><img src=\"");
    document.write(snowflake + "\" border=\"0\"></layer>");
      }
    } else if (ie4up) {
    if (i == 0) {
    document.write("<div id=\"dot"+ i +"\" style=\"POSITION: ");
    document.write("absolute; Z-INDEX: "+ i +"; VISIBILITY: ");
    document.write("visible; TOP: 99px; LEFT: 15px;\"><img src=\"");
    document.write(snowflake + "\" border=\"0\"></div>");
    } else {
    document.write("<div id=\"dot"+ i +"\" style=\"POSITION: ");
    document.write("absolute; Z-INDEX: "+ i +"; VISIBILITY: ");
    document.write("visible; TOP: 99px; LEFT: 15px;\"><img src=\"");
    document.write(snowflake + "\" border=\"0\"></div>");
          }
      }
    }
    function snowNS() {  // Netscape 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();
    doc_width = self.innerWidth;
    doc_height = self.innerHeight;
    }
    dx[i] += stx[i];
    document.layers["dot"+i].top = yp[i];
    document.layers["dot"+i].left = xp[i] + am[i]*Math.sin(dx[i]);
    }
    setTimeout("snowNS()", speed);
    }
    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();
    doc_width = document.body.clientWidth;
    doc_height = document.body.clientHeight;
    }
    dx[i] += stx[i];
    document.all["dot"+i].style.pixelTop = yp[i];
    document.all["dot"+i].style.pixelLeft = xp[i] + am[i]*Math.sin(dx[i]);
    }
    setTimeout("snowIE()", speed);
    }
    if (ns4up) {
    snowNS();
    } else if (ie4up) {
    snowIE();
    }
   
    </script>