<html>
<head>
<script language="javascript">
function abrirvinculos(){
window.open('http://poison01.com', '1');
window.open('http://poison02.com', '2');
}
</script>
</head>
<body>
<div style="background-color:#FF0000">
<div style="background-color:#123456; padding-left:25px"><a href="#" onClick="abrirvinculos();"><h1>Abrir vínculo doble</h1></a>
</div>
<div align="center">
<iframe width="350" height="100%" frameborder="0" scrolling="auto" style="background-color:#000000" name="1"></iframe>
<iframe width="350" height="100%" frameborder="0" scrolling="auto" style="background-color:#000000" name="2"></iframe>
</div>
<div style="background-color:yellow">footer</div>
</div>
</body>
</html>