var DivOneClassArr = new Array();
    var DivTwoClassArr = new Array();

    function getElementsByClassName(ClassName1, ClassName2, obj) {
        if (obj.className == ClassName1) {
            DivOneClassArr[DivOneClassArr.length] = obj;
        }
        if (obj.className == ClassName2) {
            DivTwoClassArr[DivTwoClassArr.length] = obj;
        }
        for (var i = 0; i < obj.childNodes.length; i++)
            getElementsByClassName(ClassName1, ClassName2, obj.childNodes[i]);
    }

    function grabtheclass() {
        DivOneClassArr.length = 0;
        aryClassElements2.length = 0;
        getElementsByClassName('content_detail', 'menu', document.body);
        for (var i = 0; i < DivOneClassArr.length || i < DivTwoClassArr.length; i++) {
            if (DivOneClassArr[i].offsetHeight > DivTwoClassArr[i].offsetHeight) {
                DivTwoClassArr[i].style.height = DivOneClassArr[i].offsetHeight + 'px';
            }
            else if (DivOneClassArr[i].offsetHeight < DivTwoClassArr[i].offsetHeight) {
                DivOneClassArr[i].style.height = DivTwoClassArr[i].offsetHeight + 'px';
            }
        }
    }
    
jQuery(document).ready(function () {
    if (jQuery('div.content_detail').height() > jQuery('div.menu').height()) {
        jQuery('div.menu').css({
            'height': jQuery('div.content_detail').height()
        });
    }
    else if (jQuery('div.menu').height() >jQuery('div.content_detail').height()) {
        $('div.content_detail').css({
            'height': jQuery('div.menu').height()
        });
    }
});