// set global variables
  var no = 10; // snow number
  var dx, xp, yp;    // coordinate and position variables
  var am, stx, sty;  // amplitude and step variables
  var i, doc_width = 800, doc_height = 600;

  // cross browser body width/height function
  if( document.body && ( document.body.scrollWidth || document.body.scrollHeight ) ) {
      var doc_width = document.body.scrollWidth;
      var doc_height = document.body.scrollHeight;
  } else if( document.body.offsetWidth ) {
    var doc_width = document.body.offsetWidth;
    var doc_height = document.body.offsetHeight;
  }

	// create arrays
  dx = new Array();
  xp = new Array();
  yp = new Array();
  am = new Array();
  stx = new Array();
  sty = new Array();
  
  // create div for each flake
  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='dot"+ i +"' style='position: absolute; z-index: "+ i +"; visibility: visible; top: 15px; left: 15px;'><a href='images/snowFlake.gif' 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='images/snowFlake.gif' border='0'></div>");
      }
   }   


  // run snow animation
  function showSnow() {  
    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("dot"+i.toString()).style.pixelTop = yp[i];
      document.getElementById("dot"+i.toString()).style.pixelLeft = xp[i] + am[i]*Math.sin(dx[i]);

    }
    setTimeout("showSnow()", 10);
  }

	// start snow animation
  showSnow();