var g_i;
var AnchoAux;
var AltoAux;
var newimg = new Image; 
function Ant(){
	if (g_i==1){
		g_i=aFotos.length-1;
	}else{
		g_i=g_i-1;
	}
	document.all.sImagen.innerHTML='<img src="'+DimeImagen()+'">';
}
function Sig(){
	if(g_i==aFotos.length-1){
		g_i=1;
	}else{
		g_i=g_i+1;
	}
	document.all.sImagen.innerHTML='<img src="'+DimeImagen()+'">';
}

function getScrollXY() {
  var scrOfX = 0, scrOfY = 0;
  if( typeof( window.pageYOffset ) == 'number' ) {
    //Netscape compliant
    scrOfY = window.pageYOffset;
    scrOfX = window.pageXOffset;
  } else if( document.body && ( document.body.scrollLeft || document.body.scrollTop ) ) {
    //DOM compliant
    scrOfY = document.body.scrollTop;
    scrOfX = document.body.scrollLeft;
  } else if( document.documentElement && ( document.documentElement.scrollLeft || document.documentElement.scrollTop ) ) {
    //IE6 standards compliant mode
    scrOfY = document.documentElement.scrollTop;
    scrOfX = document.documentElement.scrollLeft;
  }
  return scrOfY;
  //return [ scrOfX, scrOfY ];
}

function evt_keyPress (e) {
	var evento = e || window.event;
	
	var caracter = evento.charCode || evento.keyCode;
	var key = String.fromCharCode(caracter).toLowerCase();
	  
	switch(key){
	case 'x':
		Cerrar();break;
	case 'a':
		Ant();break;
	case 's':
		Sig();break;
	}
}

function DimeImagen(){
	newimg.src = DirFotos+'/Copia de '+aFotos[g_i];
	return DirFotos+'/Copia de '+aFotos[g_i];
}

function MostrarImg(Foto){
	//Obtener el i
	for (k=0;k<aFotos.length;k++){
		if (aFotos[k]==Foto){i=k;}
	}
	g_i=i;
	var x, y;
	
	// for all except Explorer
	if (self.innerHeight) {
		x = self.innerWidth-18;
		y = self.innerHeight;
		
		// Explorer 6 Strict Mode
	} else if (document.documentElement
		&& document.documentElement.clientHeight) {
		x = document.documentElement.clientWidth;
		y = document.documentElement.clientHeight;
		
		// other Explorers
		} else if (document.body) {
		x = document.body.clientWidth;
		y = document.body.clientHeight;
	}
	document.all.sImagen.innerHTML='<img src="'+DimeImagen()+'">';
	document.all.dFoto.style.width=x;document.all.dFoto2.style.width=x;
	document.all.dFoto.style.height=3000;document.all.dFoto2.style.height=3000;
	document.all.dFoto.style.display="block";
	document.all.dFoto2.style.top=20+getScrollXY();
	document.all.dFoto2.style.display="block";
}
function Cerrar(){
	document.all.dFoto.style.display='none';
	document.all.dFoto2.style.display='none';
}
document.onkeypress = evt_keyPress;