$(document).ready(function() {
    var h1 = $("#ergo_left").height();
    var h2 = $("#ergo_right").height();
    var h = 0;
    if(h1 > h2) {
        h = h1;
    }
    else {
        h = h2;
    }
    
    $("#ergo_left, #ergo_right").css("height", h);
});