function fecha(){
	var d=new Date();
	var f = d.getFullYear();
		if (f > 2007) {
			ff = "-" + f; 
			return ff;
		} else {
			d="";
			return d;
		}
}

function ampliar_01() {
	ven = open("agradecimientos.htm","01_default","width=550,height=320,status=no,toolbar=no,menubar=no,scrollbars=no");
}

function actividad_intermedio(x,y,z,t) {
     ven =open("nivelII/"+x+".htm","actividad","width="+y+",height="+z+",status=no,toolbar=no,menubar=no,scrollbars="+t); 
}
function actividad(x,y,z,t) {
     ven =open("nivelI/"+x+".htm","actividad","width="+y+",height="+z+",status=no,toolbar=no,menubar=no,scrollbars="+t); 
}
function ficha_intermedio(x,y,z,t) {
     ven =open("nivelII/"+x+".htm","ficha","width="+y+",height="+z+",status=no,toolbar=no,menubar=no,scrollbars="+t); 
}
function ficha(x,y,z,t) {
     ven =open("nivelI/"+x+".htm","ficha","width="+y+",height="+z+",status=no,toolbar=no,menubar=no,scrollbars="+t); 
}
function fichaactividad(x,y,z,t) {
     ven =open(x+".htm","ficha","width="+y+",height="+z+",status=no,toolbar=no,menubar=no,scrollbars="+t); 
}
function cerrar() {
 self.close()
}
function imprime(){
	bName = navigator.appName;
	bVer = parseInt(navigator.appVersion);
	if (bName == "Netscape" && bVer >=4)
			print();
	else if (bName == "Microsoft Internet Explorer" && bVer >= 4)
			print();
}