Possibly save 1 hour of your time: Often you may need to display or hide a certain element based on some condition.

function displayHtmlElement() {

    if (condition !== "") {

        $(element1).css('display', 'none');

        $(element2).css('display', 'block');

    } else {

        $(element1).css('display', 'block');

        $(element2).css('display', 'none');

    }

}