function fichasmall(mypage)
{
	fichawindow = window.open(mypage,'ficha','toolbar=no,location=no,menubar=no,resizable=no,scrollbars=yes,width=500,height=300,dependent=yes');
	fichawindow.focus();
}

function ficha(mypage)
{
	var width = 770 , height = 550 ;
	x = (850 - width)/2, y = (600 - height)/2;

	if (screen) 
	{
		y = (screen.availHeight - height)/2;
		x = (screen.availWidth - width)/2;
	}

	fichawindow = window.open(mypage,'ficha','toolbar=no,location=no,menubar=no,resizable=no,scrollbars=yes,dependent=yes,width='+ width+ ',height='+ height+',screenX='+x+',screenY='+ y +',left='+x+',top='+ y + ',{0}') ;

	fichawindow.focus();
}