[jQuery] simple query does not work

[dongle]

i am making this(it does not work) :

$(document).ready(function(){


  $("div#photolinks img").get(0).css("border","5px solid black;");


});

if i do this:

$(document).ready(function(){


  $("div#photolinks img").css("border","5px solid black;");


});


it does work, whats wrong?
thanks