var img,ancho,alto;
function opiniones(img,ancho,alto){ //v3.0 
  var winprops="toolbar=no,location=no,directories=no,status=no,menubar=no,resizable=yes,copyhistory=no,scrollbars=yes,width=" + 
              ancho + ",height=" + alto + ",left=100,top=4";
  window.open(img,'fotomaq',winprops);
}

function ofertademanda(img,ancho,alto){ //v3.0 
  var winprops="toolbar=no,location=no,directories=no,status=no,menubar=no,resizable=yes,copyhistory=no,scrollbars=yes,width=" + 
              ancho + ",height=" + alto + ",left=100,top=4";
  window.open(img,'fotomaq',winprops);
}