Jquery implements an example of a bottom up effect

The most common way to do this is to simply use slideUp and slideDown.
If the div you want to expand is positioned through position:absolute, and it's positioned relative to the bottom, like bottom:0px, then slideDown is called up.

(because slideDown basically means that you dynamically change the height of the element, the bottom is fixed, and the height increases as it gets higher.)

 //

 $('.remm_product ul li').hover(

  function(){

   $(this).find('.p_info').slideDown();

  },

  function(){

   $(this).find('.p_info').slideUp();

  }

 )