banners = new Array(1);
banners[0] = "http://www.adbanner.com.br/conteudo/120x600/flash.jsp?url=http://site.hotwords.com.br/campanhas/concursosculturais/iphone/120x600.swf";
var ran_unrounded=Math.random()*banners.length;
ran_number = Math.floor(ran_unrounded);
document.write('<iframe src="' + banners[ran_number] + '" width="120" height="600" scrolling=no frameborder=0 marginwidth=0 marginheight=0></iframe>');