Pop Up centrado

[DragonX]

Código HTML:

<script>
function AbrirPopupCentrado(ventana){ 
        ancho = 400; // ancho de tu ventana
        alto = 600; // alto de tu ventana
        y = screen.height/2 - alto/2; 
        x = screen.width/2 - ancho/2;
        window.open(ventana,"","toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=0,resizable=0,copyhistory=0,left="+x+",top="+y+", width=400,height=600")
}
</script>