function isdefined(object, variable)
{
	return (typeof(eval(object)[variable]) != 'undefined');
}
function siguiente(){
	if(id_actual+1 > total) i = 1;
	else i=id_actual+1;

	carga(i);
	

}
function anterior(){
	if(id_actual-1==0) i = total;
	else i=id_actual-1;	
	carga(i);	
}

function carga(i){

	var f = document.getElementById("td_foto");	
	src_actual = "./img/promociones/"+id+"/"+tipo+"/big/"+i+".jpg";// images[i-1].src;
	src_download = "./img/promociones/"+id+"/"+tipo+"/download/"+i+".jpg";
	f.innerHTML='<img src="'+src_actual+'" width="501" height="376" border="0" />';	

	//f.style.background = "url('"+src_actual+"')";
	id_anterior = id_actual;

	id_actual = i;
	
	
	if(isdefined(window,"onCargaComplete")){
		onCargaComplete(i);
	}
}

function lanzaImagen(){
	//lanzaDireccion("imagen.php?src="+src_download,800,600);
	location.href = "/download.php?fichero="+src_download;
	
}

function precarga(directorio,tope){
	imagenes = new Array();
	for(var i=1;i<=tope;i++){
		imagenes[i] = new Image();
		imagenes[i].src = directorio+"/"+i+".jpg";
		
	}
	
}

window.onload = function(){
	//precarga();
	siguiente();
}