var max      = 10;
  var nrImages = 04;
  function makeImages() {    
    this[0]     = "http://www.planetabizarro.net/wp-content/uplouds/2009/09/piscinas.gif"; 
	this[1]     = "http://www.quickcloud.com.br/banner.gif";     
	this[2]     = "http://static.minilua.com/wp-content/uploads/media/imagens/parceiros/sticky/portalbizarrocom.jpg"; 
      this[3]     = "http://www.planetabizarro.net/wp-content/uplouds/2009/09/piscinas.gif"; 	
    this.length = nrImages;
}
  function makeLinks() {       
    this[0]     = "http://www.mariareispiscinas.com.br/";
	this[1]     = "http://www.quickcloud.com.br/aff.php?aff=002";    
	this[2]     = "http://www.portalbizarro.com/";
      this[3]     = "http://www.mariareispiscinas.com.br/";
	 this.length = nrImages;

  }
  var vetImages = new makeImages();
  var vetLinks  = new makeLinks();
  var x = Math.round(Math.random()*max);
  var y    = max / nrImages;
  for(var cont = 1;cont*y <= max;cont++) {
    if (x <= (cont*y)) {
      document.write("<a href="+vetLinks[cont-1]+" target=_blank><img  src="+vetImages[cont-1]+" border=0></a>");
      break;
    }
  }