function cambiarImagen(imagen)
{
	document.fotoCalidad.src=imagen;
}

function lanzacentrado(url, nombre, atributos, ancho, alto)
{
            if(ancho>screen.availWidth) ancho=screen.availWidth;
            if(alto>screen.availHeight) alto=screen.availHeight;
                var str = ",height=" + alto + ",innerHeight=" + alto;
            str += ",width=" + ancho + ",innerWidth=" + ancho;
            if (window.screen)
            {
                        var ah = screen.availHeight - 30;
                        var aw = screen.availWidth - 10;
                        var xc = (aw - ancho) / 2;
                        var yc = (ah - alto) / 2;
                        str += ",left=" + xc + ",screenX=" + xc;
                        str += ",top=" + yc + ",screenY=" + yc;
//                      str += ",left=0,screenX=0";
//                      str += ",top=0,screenY=0";
            }
            atributos=atributos + str;
//          alert("Atributos -->"+atributos);
            popventana = window.open(url, nombre, atributos);
            popventana.focus();
}

function popup(url,alto,ancho)
{ 
            props = "status=0,scrollbars=1";
            lanzacentrado(url, "popup", props, ancho, alto);
}