<!-----------------------------------------------------------------------------
var meses = new Array("January","February","March","April","May","June","July",
					  "August","September","October","November","December", "Summary");
var faltan = new Array(1891,1900,1901,1902,1903,1904,1905,1906,1907,1908,1909,1911,1912,1913,1914,1915,1916,1917,1918,1919,1920,1921,1922,1923,1924,1925,1926,1927,1929,1930,1931,1932,1933,1934);
function ver_en_blanco(aa) {
	var en_blanco=false;
	for (var i=0; i < faltan.length; i++) {
		if (faltan[i] == aa) {
			en_blanco=true;
			break;
		}
	}
	if (en_blanco) {
		//		   alert("page left blank");
		return false;
	}
	else
		return true;
};			 		 
function verificar_pagina(form) {
	
	var k;
    for( k=0; k < form.year.length; ++k ) {
        if( form.year[k].selected ) {
            a =k;
            break;
        }
    }
	var aa=parseInt(form.year.value);
	var resultado=ver_en_blanco(aa);
	return resultado;
};

function libro(ianio, imes, primero, ultimo, pagina) {
  var aux, isem, numstr, res;
  this.prim=primero;
  this.ult=ultimo;
  this.pag=pagina;
	this.mes= imes;
	this.anio=ianio;

 this.ant=function() {
    var ames = this.mes - 1;
		var aanio = this.anio;
    if (ames == 0) {
		   aanio = aanio - 1;
			 ames = 13;
			 if (aanio < this.prim) {
			     aanio = this.prim;
					 ames=1;
			}
		}	
    var numstr=aanio.toString();
		var numstr1=ames.toString();
    res=new String();
    res += this.pag+".html?year="+numstr+"&month="+numstr1;
     return(res);
 };
  this.prox=function() {
    var ames = this.mes+1;
		var aanio = this.anio;
    if (ames > 13) {
		   aanio = aanio +1;
			 ames = 1;
			 if (aanio > this.ult) {
			     aanio = this.ult;
					 ames=13;
			}
		}	
    numstr=aanio.toString();
		numstr1=ames.toString();
    res=new String();
    res += this.pag+".html?year="+numstr+"&month="+numstr1;
    return(res);
 };
 this.imagen=function(){
   var aux=this.anio-1000;
   numstr=aux.toString();
   res=new String();
   res += "D"+numstr+"70";
   aux = this.mes;
	 numstr=aux.toString();
   if (numstr.length == 1) res+="0"+numstr;
	 else res+=numstr;
   res+=".JPG";
   return(res);
 };
 }
var pri_hoja = 1887;
var ult_hoja = 1934;
var partes=location.href.toString().split("\\");
var ianio = pri_hoja;
var nombres="";
if (partes.length == 1) {
    partes=location.href.toString().split("\/");
 }
if (partes[partes.length-1]) {
  var pag=partes[partes.length-1];
	var imes=1;
  nombres = pag.split(".");
  if(nombres[1]){
   var r=nombres[1];
   var resto=r.split("=");
   if (resto[1]) {
	   aux=resto[1];
		 aux=aux.split("&");
		 ianio=parseInt(aux[0]);
		 if (resto[2]) {
		     aux=resto[2];
				 aux=aux.split("&");
         imes=parseInt(aux[0]);
     }
   } 
}
var pagbase = new libro(ianio, imes, pri_hoja, ult_hoja, nombres[0]);
      
/*
 document.write("<p>anio: "+pagbase.anio+"<\/p>");
document.write("<p>mes: "+pagbase.mes+"<\/p>");
document.write("<p>imagen: "+pagbase.imagen()+"<\/p>");
document.write("<p>prox: "+pagbase.prox()+"<\/p>");
document.write("<p>ant: "+pagbase.ant()+"<\/p>");
*/
}
//---------------------------------------------------------------------------->

