function coquadroSetPosition() {
    $('.coquadro_div').css({"left": ($('.coquadro_link').position().left - ($('.coquadro_div').width()>>1)) + "px",
                            "top": ($('.coquadro_link').position().top - $('.coquadro_div').height()) + "px"});
}
$(document).ready(function() {
    // fade
    $('.coquadro_link').hover(
      // function in
      function(){coquadroSetPosition();$('.coquadro_div:hidden:first').fadeIn(700);},
      // function out
      function(){$('.coquadro_div:visible').fadeOut(700);});
});