function fecha_banner()
{
	var banner_obj = document.getElementById('banner_popup');
	banner_obj.style.display = 'none';
}

function fecha_banner_timeout()
{
	setTimeout('fecha_banner()', 10000);
}

function abre_banner()
{
	var banner_obj = document.getElementById('banner_popup');

	x = parseInt((screen.width - 250)/2);
    y = parseInt((screen.height - banner_obj.height)/2);
	
    //alert(x + '\n' + y);
	//alert(screen.width+'\n'+banner_obj.style.width+'\n'+x);
    
	banner_obj.style.left = x;
	banner_obj.style.top = '200px';

	banner_obj.style.display = '';

	//fecha_banner_timeout();
}