function ventanita(x,y,z,t) {
		y = 20 + y;
		z = 20 + z;
	if (navigator.appName == 'Netscape') {
		ven = open("fichas/"+x+".htm","ventana","width="+y+",height="+z+",status=no,toolbar=no,menubar=no,scrollbars="+t);
	} else {
		ven = open("fichas/"+x+".htm","ventana","width="+y+",height="+z+",status=no,toolbar=no,menubar=no,scrollbars="+t);
	}
}