equalheight.js

var currentTallest = 0,
   currentRowStart = 0,
   rowDivs = new Array(),
   $el,
   topPosition = 0;

jQuery(document).ready(function($) {
  $('.edd_download').each(function() {

   $el = $(this);
   topPostion = $el.position().top;

   if (currentRowStart != topPostion) {

     // we just came to a new row.  Set all the heights on the completed row
     for (currentDiv = 0 ; currentDiv < rowDivs.length ; currentDiv++) {
       rowDivs[currentDiv].height(currentTallest);
     }

     // set the variables for the new row
     rowDivs.length = 0; // empty the array
     currentRowStart = topPostion;
     currentTallest = $el.height();
     rowDivs.push($el);

   } else {

     // another div on the current row.  Add it to the list and check if it's taller
     rowDivs.push($el);
     currentTallest = (currentTallest < $el.height()) ? ($el.height()) : (currentTallest);

  }

  // do the last row
   for (currentDiv = 0 ; currentDiv < rowDivs.length ; currentDiv++) {
     rowDivs[currentDiv].height(currentTallest);
   }
  })
})