var clear_cache_timeout_id;
function clearCache(e)
{
    window.clearTimeout(clear_cache_timeout_id);
    $(e).text("Clearing...");
    var url = _ADMIN_DIR + "tools/clearcache";
    var par = { _rn: Math.random() };
    $.post(url, par, function(clear_count) {
        var clear_count = parseInt(clear_count);
        if(clear_count > 0)
        {
            $(e).text(clear_count + " file(s) has been deleted").css({color: 'green'});
        }
        else
        {
            $(e).text("Has been deleted before").css({color: 'orange'});
        }
        clear_cache_timeout_id = window.setTimeout(function() {
            $(e).text("Clear Cache").css({color: 'gray'});
        }, 2000);
    });
}