[j0hnik]

function setEqualHeight(columns)
{
var tallestcolumn = 0;
columns.each(
function()
{
currentHeight = $(this).height();
if(currentHeight > tallestcolumn)
{
tallestcolumn = currentHeight;
}
}
);
columns.height(tallestcolumn);
}
$(document).ready(function() {
setEqualHeight($(".columns > div.hd2"));
 $( window ).resize(function() {
   setEqualHeight($(".columns > div.hd2"));
 });
});

верх тоже нужен