function showObject(obj) 
{
    obj.className = "visible"
}
function hideObject(obj) 
{
    obj.className = "hidden"
}

function reloadCaptcha() {

var img_name = Math.floor(new Date().getTime()/1000)+Math.floor(Math.random() * 1000), img = new Image();
$('#captcha').attr('src','/img/z.jpg');
//alert(img_name);
$(img).attr('src','/captcha/'+img_name+'.jpg').load(function(){

$('#captcha').attr('src','/captcha/'+img_name+'.jpg');
//alert(img_name);
});
}