动态地将元素的高度更改为另一个元素

Well here we have two columns A and B. The thing is column A generally contains more content so its height is more (in this case 126px) and column B has less content so it remains shorter (here 94px). Now I want to make the height of B = A, considering that height of column A might change dynamically by AJAX but to keep pace with column A, height of column B must also change. Well here we have two columns A and B. The thi