function abrir_imgn1(pagina)
{vimagen=window.open(pagina,"vimagen","width=720, height=520, top=150, left=150,toolbar=no, location=no,directories=no,status=no,menubar=no,scrollbars=yes,copyhistory=no,resizable=no");
vimagen.focus();}
function abrir_imgn2(pagina)
{vimagen=window.open(pagina,"vimagen","width=640, height=320, top=150, left=150,toolbar=no, location=no,directories=no,status=no,menubar=no,scrollbars=yes,copyhistory=no,resizable=no");
vimagen.focus();}
function abrir_imgn3(pagina)
{vimagen=window.open(pagina,"vimagen","width=720, height=590, top=150, left=150,toolbar=no, location=no,directories=no,status=no,menubar=no,scrollbars=yes,copyhistory=no,resizable=no");
vimagen.focus();}