//Autumn leaves- by Kurt Grigg (kurt.grigg@virgin.net)
//Modified by Dynamic Drive for NS6 functionality
//visit http://www.dynamicdrive.com for this script
//Modified 2012 by Tobias Berndt 

//Pre-load your image below!
grphcs = new Array (3)
Image0 = new Image ();
Image0.src = grphcs [0] = 'script/snowflake1.gif';
Image1 = new Image ();
Image1.src = grphcs [1] = 'script/snowflake2.gif';
Image2 = new Image ();
Image2.src = grphcs [2] = 'script/snowflake3.gif';

Amount = 20; //Smoothness depends on image file size, the smaller the size the more you can use!
Ypos = new Array();
Xpos = new Array();
Speed = new Array();
Step = new Array();
Cstep = new Array();

// ns = (document.layers) ? 1 : 0;
// ns6 = (document.getElementById && !document.all) ? 1 : 0;

var ns = (navigator.appName.indexOf ("Netscape") >= 0 && parseFloat(navigator.appVersion) >= 4 && parseFloat(navigator.appVersion) < 5) ? true : false;
var IE4 = (document.all) ? true : false;
var ns6 = (parseFloat (navigator.appVersion) >= 5 && navigator.appName.indexOf ("Netscape") >= 0 ) ? true : false;

  if (ns) 
  { 
    for (i = 0; i < Amount; i++)
    {
      var P = Math.floor (Math.random () * grphcs.length);

      rndPic = grphcs [P];
      document.write ('<LAYER NAME="sn"' + i + '" LEFT="-200px" TOP=0><img src="' + rndPic + '" /></LAYER>');
    }
  }
  else
  {
    document.write ('<div style="position:absolute; top:0px; left:-200px"><div style="position:relative">');
    for (i = 0; i < Amount; i++)
    {
      var P = Math.floor (Math.random () * grphcs.length);

      rndPic = grphcs [P];
      document.write ('<img id="si' + i +'" src="' + rndPic + '" style="position:absolute; top:0px; left:0px" />');
    }
    document.write ('</div></div>');
  }
  WinHeight = (ns || ns6) ? window.innerHeight : window.document.body.clientHeight;
  WinWidth = (ns || ns6) ? window.innerWidth : window.document.body.clientWidth;
  for (i = 0; i < Amount; i++)
  {                                                                
    Ypos [i] = Math.round (Math.random () * WinHeight);
    Xpos [i] = Math.round (Math.random () * WinWidth);
    Speed [i]= Math.random () * 1 + 3;
    Cstep [i] = 0;
    Step [i] = Math.random () * 0.1 + 0.05;
  }
  
function fall ()
{
  var WinHeight = (ns || ns6) ? window.innerHeight : window.document.body.clientHeight;
  var WinWidth = (ns || ns6) ? window.innerWidth : window.document.body.clientWidth;
  var hscrll = (ns || ns6) ? window.pageYOffset : document.body.scrollTop;
  var wscrll = (ns || ns6) ? window.pageXOffset : document.body.scrollLeft;
  
  for (i = 0; i < Amount; i++)
  {
    sy = Speed [i] * Math.sin (90 * Math.PI / 180);
    sx = Speed [i] * Math.cos (Cstep [i]);
    Ypos [i] += sy;
    Xpos [i] += sx; 
    if (Ypos [i] > WinHeight - 70)
	{
      Ypos [i] =- 60;
      Xpos [i] = Math.round (Math.random () * WinWidth);
      Speed [i] = Math.random () * 1 + 2;
    }
    if (ns)
	{
      document.layers ['sn' + i].left = Xpos [i];
      document.layers ['sn' + i].top = Ypos [i] + hscrll;
    }
    else if (ns6)
	{
      document.getElementById ("si" + i).style.left = Math.min (WinWidth, Xpos [i]) + 'px';
      document.getElementById ("si" + i).style.top = Ypos [i] + hscrll + 'px';
    }
    else
	{
      eval ("document.all.si" + i).style.left = Xpos [i] + 'px';
      eval ("document.all.si" + i).style.top = Ypos [i] + hscrll + 'px';
    } 
    Cstep [i] += Step [i];
  }
  setTimeout('fall ()', 40);
}

window.onload = fall ();