jquery.equalheights.js

// simple equal column heights
// sets the height of each matched div to that of the tallest element in the collection
// Usage: $("#div1, #div2, #div3").equalHeights();

$.fn.equalHeights = function(){
    var heights = [], i = this.length;
    while(i--){ heights[i] = this.eq(i).height(); }
    return this.height(Math.max.apply(Math, heights));
}