var no = 30; // numero de flocos de neve - This script is copyright Altan
var speed = 10; // quanto menor o numero, mais rapido o floco se movera http://www.altan.hr/snow
var snowflake = "http://www.ampliar.com/natal/neve.gif"; // imagem do "floco de neve"

var ns4up = (document.layers) ? 1 : 0; // detecta o browser do internauta
var ie4up = (document.all) ? 1 : 0;
var dx, xp, yp; // variaveis de coordenacao e posicao
var am, stx, sty; // variaveis de amplitude e passo
var i, doc_width = 800, doc_height = 600;
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; // define variaveis de coordenacao
  xp[i] = Math.random()*(doc_width-50); // define variaveis de posicionamento
  yp[i] = Math.random()*doc_height;
  am[i] = Math.random()*20; // define variaveis de amplitude
  stx[i] = 0.02 + Math.random()/10; // define variaveis de passo
  sty[i] = 0.7 + Math.random(); // define variaveis de passo
  if (ns4up) { // define 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: "+ i +"; 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: "+ i +"; VISIBILITY: ");
      document.write("visible; TOP: 15px; LEFT: 15px;\"><img src=\"");
      document.write(snowflake + "\" border=\"0\"></div>");
    }
  }
}
function snowNS() { // função de animação para o Netscape
  for (i = 0; i < no; ++ i) { // para cada floco
    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() { // função de animação para o IE
  for (i = 0; i < no; ++ i) { // para cada floco
    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();
}