def add_html_hoover(text, hoover_text, text_color='', url=''):
    """Add a "title" to a text, using an empty href link, in order to create a mouseover"""
    if text_color != '': text_color = '; color: ' + text_color
    return '<a href="'+url+'" style="text-decoration: none' + text_color + '" title="' + hoover_text + '">' + text + '</a>'