function popitup()
{
	//calcula el tamaņo de pantalla
	var pAncho = screen.width;
	var pAlto = screen.height;
	var posx = (pAncho-487)/2;
	var posy = (pAlto-389)/2;
	//abre pop up
	nuevaVentana=window.open('video_pop.html','plano','height=389,width=487,left='+posx+',top='+posy+'');
	if (window.focus) {nuevaVentana.focus()}
}
function interfacec()
{
	//calcula el tamaņo de pantalla
	var pAncho = screen.width;
	var pAlto = screen.height;
	var posx = (pAncho-760)/2;
	var posy = (pAlto-420)/2;
	//abre pop up
	nuevaVentana=window.open('relojberri_c.html','relojberri','height=420,width=760,left='+posx+',top='+posy+'');
	if (window.focus) {nuevaVentana.focus()}
}
function interfacee()
{
	//calcula el tamaņo de pantalla
	var pAncho = screen.width;
	var pAlto = screen.height;
	var posx = (pAncho-760)/2;
	var posy = (pAlto-420)/2;
	//abre pop up
	nuevaVentana=window.open('relojberri_e.html','relojberri','height=420,width=760,left='+posx+',top='+posy+'');
	if (window.focus) {nuevaVentana.focus()}
}
function interfacei()
{
	//calcula el tamaņo de pantalla
	var pAncho = screen.width;
	var pAlto = screen.height;
	var posx = (pAncho-760)/2;
	var posy = (pAlto-420)/2;
	//abre pop up
	nuevaVentana=window.open('relojberri_i.html','relojberri','height=420,width=760,left='+posx+',top='+posy+'');
	if (window.focus) {nuevaVentana.focus()}
}