Optimise speed for loading edit mode when clicking edit btn:
    $('#id').show() --> $('#id').css("display", "");
    $('#id').hide() --> $('#id').css("display", "none");
jQuery-1.8.2: onEditMode()>show()>showHide()>isHidden()>css()>curCSS()>getComputedStyle()
    curCSS() function takes up too much time
jQuery-1.7.2: onEditMode()>show()>css()>getComputedStyle()
    getComputedStyle() function takes up too much time