$.fn.equalHeights = function(px) {
    $(this).each(function() {
        var currentTallest = 0;
        $(this).children().each(function(i) {
            if ($(this).height() > currentTallest) { currentTallest = $(this).height(); }
        });
        if (!px || !Number.prototype.pxToEm) currentTallest = currentTallest.pxToEm(); //use ems unless px is specified
        // for ie6, set height since min-height isn't supported
        if ($.browser.msie && $.browser.version == 6.0) { $(this).children().css({ 'height': currentTallest }); }
        $(this).children().css({ 'min-height': currentTallest });
    });
    return this;
};

Number.prototype.pxToEm = String.prototype.pxToEm = function(settings) {
    //set defaults 
    settings = jQuery.extend({
        scope: 'body',
        reverse: false
    }, settings);

    var pxVal = (this == '') ? 0 : parseFloat(this);
    var scopeVal;
    var getWindowWidth = function() {
        var de = document.documentElement;
        return self.innerWidth || (de && de.clientWidth) || document.body.clientWidth;
    };

    /* When a percentage-based font-size is set on the body, IE returns that percent of the window width as the font-size. 
    For example, if the body font-size is 62.5% and the window width is 1000px, IE will return 625px as the font-size.     
    When this happens, we calculate the correct body font-size (%) and multiply it by 16 (the standard browser font size) 
    to get an accurate em value. */

    if (settings.scope == 'body' && $.browser.msie && (parseFloat($('body').css('font-size')) / getWindowWidth()).toFixed(1) > 0.0) {
        var calcFontSize = function() {
            return (parseFloat($('body').css('font-size')) / getWindowWidth()).toFixed(3) * 16;
        };
        scopeVal = calcFontSize();
    }
    else { scopeVal = parseFloat(jQuery(settings.scope).css("font-size")); };

    var result = (settings.reverse == true) ? (pxVal * scopeVal).toFixed(2) + 'px' : (pxVal / scopeVal).toFixed(2) + 'em';
    return result;
};