html - Why I can't move an image by JQuery? -

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i have tryed move image whi jquery, when press key on keyboard, doesn't work. problem?

here's code:

<html> <head> <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script> <script>     $(document).ready(function(){         $(document).keydown(function(){             $(document).find("img").animate({                 top:"+=100px",             });         });     }); </script> </head> <body>     <img src="player.jpg"> </body> </html>

thanks lot!

this thing should change:

<img style="position: relative" src="player.jpg">

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