function prev_cat(imagen,leyenda) {

  var remote = open('prev_cat.htm?' + imagen + '&' + leyenda,"frm_cat", "width=500,height=650,resizable=yes,scrollable=yes,scrollbars=yes,menubar=no,status=no,toolbar=no,location=no,directories=no");

  if (navigator.appName == "Netscape") remote.focus ();

}
function prev_cat_ing(imagen,leyenda) {

  var remote = open('prev_cat_ing.htm?' + imagen + '&' + leyenda,"frm_cat", "width=500,height=650,resizable=yes,scrollable=yes,scrollbars=yes,menubar=no,status=no,toolbar=no,location=no,directories=no");

  if (navigator.appName == "Netscape") remote.focus ();

}
function prev_map(leyenda) {

  var remote = open('prev_map.htm?'+ leyenda,"frm_map", "width=800,height=600,resizable=yes,scrollable=yes,scrollbars=yes,menubar=no,status=no,toolbar=no,location=no,directories=no");

  if (navigator.appName == "Netscape") remote.focus ();

}
function prev_map_ing(leyenda) {

  var remote = open('prev_map_ing.htm?'+ leyenda,"frm_map", "width=800,height=600,resizable=yes,scrollable=yes,scrollbars=yes,menubar=no,status=no,toolbar=no,location=no,directories=no");

  if (navigator.appName == "Netscape") remote.focus ();

}