var snowsrc = "/images/snow.gif"
var no      = 10;
var ns4up   = (document.layers) ? 1 : 0;  
var ie4up   = (document.all)    ? 1 : 0;
var dx, xp, yp;    
var am, stx, sty; 
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;                        
  xp[i]  = Math.random()*(doc_width-50);  
  yp[i]  = Math.random()*doc_height;
  am[i]  = Math.random()*20;         
  stx[i] = 0.02 + Math.random()/10; 
  sty[i] = 0.7  + Math.random();     
  if (ns4up) {                      
    if (i == 0) {
      document.write("<layer name=\"dot"+ i +"\" left=\"15\" top=\"15\" visibility=\"show\"><a href=\"http://www.jswelt.de/\"><img src='"+snowsrc+"' border=\"0\"></a></layer>");
    } else {
      document.write("<layer name=\"dot"+ i +"\" left=\"15\" top=\"15\" visibility=\"show\"><img src='"+snowsrc+"' border=\"0\"></layer>");
    }
  } else if (ie4up) {
    if (i == 0) {
      document.write("<div id=\"dot"+ i +"\" style=\"POSITION: absolute; Z-INDEX: "+ i +"; VISIBILITY: visible; TOP: 15px; LEFT: 15px;\"><a href=\"http://java.topcool.de\"><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 snowNS() {  
  for (i = 0; i < no; ++ i) {  
    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()", 10);
}
  
function snowIE() {  
  for (i = 0; i < no; ++ i) {  
    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()", 10);
}

if (ns4up) {
  snowNS();
} else if (ie4up) {
  snowIE();
}