$('.corpo_buttons_asia').click(function() {
    $('.info').css('visibility', 'hidden');
    $('.info2').css('visibility', 'visible');
    $(this).css('z-index', '20');
    $(this).css('background-color', 'rgb(23,55,94)');
    $(this).css('color', '#FFF');
    $('.corpo_buttons_global').css('background-color', 'rgb(197,197,197)');
    $('.corpo_buttons_global').css('color', '#383838');
});

$('.corpo_buttons_global').click(function() {
    $('.info').css('visibility', 'visible');
    $('.info2').css('visibility', 'hidden');
    $(this).css('background-color', 'rgb(23,55,94)');
    $(this).css('color', '#FFF');
    $('.corpo_buttons_asia').css('z-index', '2');
    $('.corpo_buttons_asia').css('background-color', 'rgb(197,197,197)');
    $('.corpo_buttons_asia').css('color', '#383838');
});

$('.theclassthatstherenow').addClass('newclasswithyourstyles').removeClass('theclassthatstherenow');

$('.theclassthatstherenow').addClass('newclasswithyourstyles');
$('.theclassthatstherenow').removeClass('theclassthatstherenow');

var el = document.querySelector('.theclassthatstherenow');
el.classList.remove('theclassthatstherenow');
el.classList.add('newclasswithyourstylerules');

var el = document.getElementsByClassName('theclassthatstherenow');
el.className = el.className.replace(/s*theclassthatstherenows*/, ' newclasswithyourstylerules ');

(function ($) {
    $.fn.replaceClass = function (pFromClass, pToClass) {
        return this.removeClass(pFromClass).addClass(pToClass);
    };
}(jQuery));

$('.divFoo').replaceClass('colored','blackAndWhite');

<div class="divFoo colored"></div>

<div class="divFoo blackAndWhite"></div>

.active {
  z-index: 20;
  background: rgb(23,55,94)
  color: #fff;
}

$(this).addClass("active");

.greenclass {color:green;}

$('selector').addClass("green");

$('selector').removeClass("green");

$("#YourID").switchClass("old-class-here", "new-class-here");

jQuery.fn.replaceClass = function(sSearch, sReplace) {
    return this.each(function() {
        var s = (' ' + this.className + ' ').replace(' ' + sSearch.trim() + ' ', ' ' + sReplace.trim() + ' ');
        this.className = s.substr(1, s.length - 2);
    });
};