function fback()
{
	window.history.back();
}
function abrir(oItems)
{
	oItems.style.display = "block";
}
function cerrar(oItems)
	{
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	}
function acstilo(oItems)
{
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}
function cambiar_contrasena()
{
	var izq = (screen.width - 200) / 2;
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	window.open('cambiar_contrasena.php','','dependent=yes,height=170,width=200,scrollbars=no,top='+arr+',left='+izq);
}
function imprimir()
{
	window.print();
	window.history.back();
}