var no        = 25;        // Snow number
var speed     = 10;        // Smaller number moves the snow faster
var snowflake = "images/hex.gif"; // Image to use as "flake".

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 = 800, doc_height = 600;
if( ns4up )  {
  doc_width = self.innerWidth;
  doc_height = self.innerHeight;
} else if( ie4up )  {
  doc_width = self.innerWidth;
  doc_height = self.innerHeight;
//    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=\"15\" visibility=\"show\"><img src=\"");
      document.write(snowflake + "\" border=\"0\"></layer>");
    } else  {
      document.write("<layer name=\"dot"+ i +"\" left=\"15\" ");
      document.write("top=\"15\" 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: 2; VISIBILITY: ");
        document.write("visible; TOP: 15px; LEFT: 15px;\"><img src=\"");
        document.write(snowflake + "\" border=\"0\"></div>");
      } else  {
        document.write("<div id=\"dot"+ i +"\" style=\"POSITION: ");
        document.write("absolute; Z-INDEX: 2; VISIBILITY: ");
        document.write("visible; TOP: 15px; 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( );
}