//noms des pages en ordre
var pages=new Array("introduction.html",
		    "definition.html",
		    "notations.html",
		    "grillage.html",
		    "voisinage.html",
		    "fonctionF.html",
		    "denombrement.html",
				"Fredkin.html",
		    "biblio.html");


//remplit tableau d'images de fleches
function remplir_gifs(gif,noms_fl) {
  
  for(var i=0;i<3;i++){
    gif[i] =new Array(3);
    for(var j=0;j<3;j++){
      gif[i][j]="images/"+noms_fl[i]+j+".gif";
    }
  }
}


//ecrit et  renvoie numero page
function ecrire_nopage(nom_pageHTML){
  var noPage=0;
  
  for(var i = 0 ; i <= pages.length ; i++)
    if(nom_pageHTML==pages[i]){ 
      noPage=i;
      break;
    }
  document.write("<small> - "+noPage+" - </small><br />");
  document.write("<br />");
  
  return noPage
    }

function aller_vers(noPage,dir){
  
    coul(dir,2);
 
   if(noPage==0 && dir==1)
     document.location="index.php";
   else{
     if(dir==1)noPage=0;
     else{noPage+=dir; noPage--;}
     document.location=pages[noPage];

   }
}

function fleche(){

}

var noms=new Array("prev","up","next");

function coul(dir,coul){ 

  document.images[noms[dir]].src="images/"+noms[dir]+coul+".gif";
}


//gestion des fleches
function fleches(nom_pageHTML){

  var debut = 0;
  var fin = 2;
  var noPage=ecrire_nopage(nom_pageHTML);
  
  if(noPage==0)
    debut = 1;
  if(noPage==pages.length-1)
    fin = 1;

  for  (var dir = debut ; dir <= fin ; dir++) {        
    document.write("<a onmouseover=\"javascript:coul("+dir+",1);\" onmouseout=\"javascript:coul("+dir+",0);\"  onclick=\"javascript:aller_vers("+noPage+","+dir+");\"><img src=\"images/"+noms[dir]+"0.gif\"  name=\""+noms[dir]+"\" id=\""+noms[dir]+"\" alt=\""+noms[dir]+" \" border=\"0\" /></a >");
  }  
}