
var no = 0; // número de imágenes
var speed = 15; // velocidad con la que cae la imagen
var snowflake = "copo_bco_smll.gif";  //imagen body
var cambia=0;

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 = 650;
  doc_height = 600;
}
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: "+ 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() {  // 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();
}*/


// para randomizar imagenes del home - stage
function writeRandomStage(){ 
var stages = new Array();

stages[0] ='<a href="/loteria/sorteos/sorteo_superior.jsp"><img name="center_piece" src="/loteria/images/stages/stage_superior.jpg" width="414" height="198" border="0" alt="Sorteo Superior"></a>';
stages[1] ='<a href="/loteria/sorteos/sorteo_zodiaco.jsp"><img name="center_piece" src="/loteria/images/stages/stage_zodiaco.jpg" width="414" height="198" border="0" alt="Sorteo Zodiaco"></a>';
stages[2] ='<a href="/loteria/sorteos/sorteo_30x30.jsp"><img name="center_piece" src="/loteria/images/stages/stage_30x30.jpg" width="414" height="198" border="0" alt="Sorteo 30 X 30"></a>';
stages[3] ='<a href="/loteria/sorteos/sorteo_mayor.jsp"><img name="center_piece" src="/loteria/images/stages/stage_mayor.jpg" width="414" height="198" border="0" alt="Sorteo Mayor"></a>';
stages[4] ='<a href="/loteria/sorteos/sorteo_lot_electronica_cajas.jsp"><img name="center_piece" src="/loteria/images/stages/stage_electronica_cajas.jpg" width="414" height="198" border="0" alt="Sorteo Lotería Electrónica"></a>';
stages[5] ='<a href="/loteria/sorteos/sorteo_gordo_navidad.jsp"><img name="center_piece" src="/loteria/images/stages/banner_navidad.jpg" width="414" height="198" border="0" alt="Sorteo Gordo de Navidad"></a>';
stages[6] ='<a href="/loteria/sorteos/sorteo_especial.jsp"><img name="center_piece" src="/loteria/images/stages/banner_especial.jpg" width="414" height="198" border="0" alt="Sorteo Especial"></a>';
stages[7] ='<a href="/loteria/sorteos/sorteo_magno.jsp"><img name="center_piece" src="/loteria/images/stages/stage_magno.jpg" width="414" height="198" border="0" alt="Sorteo Magno"></a>';
/*
stages[0] ='<a href="/loteria/sorteos/sorteo_superior.jsp"><img name="center_piece" src="/loteria/images/stages/stage_superior.jpg" width="414" height="198" border="0" alt="Sorteo Superior"></a>';
stages[1] ='<a href="/loteria/sorteos/sorteo_zodiaco.jsp"><img name="center_piece" src="/loteria/images/stages/stage_zodiaco.jpg" width="414" height="198" border="0" alt="Sorteo Zodiaco"></a>';
stages[2] ='<a href="/loteria/sorteos/sorteo_30x30.jsp"><img name="center_piece" src="/loteria/images/stages/stage_30x30.jpg" width="414" height="198" border="0" alt="Sorteo 30 X 30"></a>';
stages[3] ='<a href="/loteria/sorteos/sorteo_mayor.jsp"><img name="center_piece" src="/loteria/images/stages/stage_mayor.jpg" width="414" height="198" border="0" alt="Sorteo Mayor"></a>';
stages[4] ='<a href="/loteria/sorteos/sorteo_lot_electronica_cajas.jsp"><img name="center_piece" src="/loteria/images/stages/stage_electronica_cajas.jpg" width="414" height="198" border="0" alt="Sorteo Lotería Electrónica"></a>';
stages[5] ='<a href="/loteria/sorteos/sorteo_gordo_navidad.jsp"><img name="center_piece" src="/loteria/images/stages/banner_navidad.jpg" width="414" height="198" border="0" alt="Sorteo Gordo de Navidad"></a>';
stages[6] ='<a href="/loteria/sorteos/sorteo_especial.jsp"><img name="center_piece" src="/loteria/images/stages/banner_especial.jpg" width="414" height="198" border="0" alt="Sorteo Especial"></a>';
stages[7] ='<a href="/loteria/sorteos/sorteo_lot_electronica_cachitomovil.jsp"><img name="center_piece" src="/loteria/images/stages/stages_cachitomovil_home.jpg" width="414" height="198" border="0" alt="Sorteo Cachito Movil"></a>';
stages[8] ='<a href="/loteria/sorteos/sorteo_magno.jsp"><img name="center_piece" src="/loteria/images/stages/stage_magno.jpg" width="414" height="198" border="0" alt="Sorteo Magno"></a>';

 */
var nrandom=Math.abs(Math.floor(Math.round(Math.random()*(stages.length-1))+0));
//alert("Llamado de index fnNavidad:writeRandomStage->nrandom " + nrandom + "  " +stages[nrandom]);
//if (nrandom==5){ snowIE();} 
document.write(stages[nrandom]);
if (nrandom==0){ muestra();} 
} 

function writeRandomStage_b(){ 
var stages = new Array();
stages[0] ='<a href="/sorteos/sorteo_superior.html"><img name="center_piece" src="/images/stages/stage_superior.jpg" width="414" height="198" border="0" alt="Sorteo Superior"></a>';
stages[1] ='<a href="/sorteos/sorteo_superior.html"><img name="center_piece" src="/images/stages/stage_superior.jpg" width="414" height="198" border="0" alt="Sorteo Superior"></a>';
var nrandom=Math.abs(Math.floor(Math.round(Math.random()*(stages.length-1))+0));
//alert("Llamado de index_b nrandomB " + nrandom + "  " +stages[nrandom]);
if (nrandom==1) {muestra_b();} 
document.write(stages[nrandom]); 

} 
