nicoswd.prototype.regenerateCaptcha = function(captcha)
{
	var image   = new Image();
	var loading = $('#loading');
	var source  = BASE_URL + '/graphics/captcha.gif';
	source     += '?' + fetch_nocache_str();
		
	loading.show();
	
	image.setAttribute('src', source);	
	image.onload = function()
	{	
		captcha.style.backgroundImage = 'url(' + source + ')';
		loading.hide();
	}
	
	return false;
}