function ensenar()
{
	document.getElementById("resumen").style.display = "block";
}
function esconder()
{
	document.getElementById("resumen").style.display = "none";
}
function credits()
{
	LeftPosition = (screen.width) ? (screen.width-300)/2 : 0;
	TopPosition = (screen.height) ? (screen.height-250)/2 : 0;
	window.open ('http://www.grafiquesg3.com/credits.asp','','width=300,height=250,scrollbars=no,statusbar=no,toolbar=no,mainbar=no,left='+LeftPosition+',top='+TopPosition+'');
}