var imgPreHome = new Image();

imgPreHome.onload = function()
{
	alert('ok');
	function hidePreHome()
	{
		$(document).ready(function () {
			$('#prehome').fadeOut("slow")
		});
	}

	setTimeout(hidePreHome, 3000);
};
imgPreHome.src.onerror = function()
{
	alert('ERREUR');
};

imgPreHome.src = 'components/com_home/css/images/pre_home3.jpg';