function loading_html(imgSrc, colspan, center)
{
    var loading = 'Loading...';
    var loadingimg = '<img src="' + imgSrc + '" alt="Loading..."/>';
    var cs;
    var ct;

    if(colspan !== null && typeof colspan == 'number')
    {
        cs = '';
        if(colspan > 0)
        {
            cs = ' colspan="' + colspan.toString() + '"';
        }
        ct = center === true ? ' style="text-align:center;"' : '';
        loading = '<tr class="loading"><td'+cs+ct+'>'+loadingimg+'</td></tr>';
    }
    else
    {
        ct = colspan === true ? ' style="display:block;heigth:16px;width:16px;margin:0 auto;"' : '';
        loading = '<span class="loading"'+ct+'>'+loadingimg+'</span>';
    }

    try
    {
        return loading;
    }
    finally
    {
        loading = null;
        loadingimg = null;
        cs = null;
        ct = null;
    }
}