$(document).ready(function() {

var currentTallest = 0;
var currentRowStart = 0;
var rowDivs = new Array();

$('#boxes div').each(function(index) {

    if(currentRowStart != $(this).position().top) {

        // we just came to a new row.  Set all the heights on the completed row
        for(currentDiv = 0 ; currentDiv < rowDivs.length ; currentDiv++) rowDivs[currentDiv].height(currentTallest);

        // set the variables for the new row
        rowDivs.length = 0; // empty the array
        currentRowStart = $(this).position().top;
        currentTallest = $(this).height();
        rowDivs.push($(this));

    } else {

        // another div on the current row.  Add it to the list and check if it's taller
        rowDivs.push($(this));
        currentTallest = (currentTallest < $(this).height()) ? ($(this).height()) : (currentTallest);

    }
    // do the last row
    for(currentDiv = 0 ; currentDiv < rowDivs.length ; currentDiv++) rowDivs[currentDiv].height(currentTallest);

});
});