There are plenty of solutions for equal height columns using jQuery (like this one by Rob Glazebrook). The basic idea is to measure all of their heights and then set all their heights to that of the tallest one.
But what if there is multiple rows of blocks and you only want to increase the heights to match in the current row? This could happen from having different sized thumbnails or different amounts of text in each box.
Stephen Akins posted a neat idea on how to solve this. The idea is largely the same, test the heights of divs
Article source: http://css-tricks.com/equal-height-blocks-in-rows/