var lastpic=5;
var lastidpic=0;
var maxpics=10;
var npics=5;
var lapso=2000;
window.addEvent('domready', function() {
	 setTimeout(toggle_pic,lapso);
	$('indevo_menu').addEvent('click',function(){ document.location.href='indevo-demoliciones-y-voladuras.html'; });
	//$('flecha_indevo').set('tween', {transition: Fx.Transitions.Expo.easeOut});
	$('indevo_menu').addEvent('mouseenter',function(){ $('flecha_indevo').tween('margin-left','20px'); });
    $('indevo_menu').addEvent('mouseleave',function(){ $('flecha_indevo').tween('margin-left','0px'); });
	$('ingenieria_menu').addEvent('click',function(){ document.location.href='ingenieria-demoliciones-y-voladuras.html'; });
	$('ingenieria_menu').addEvent('mouseenter',function(){ $('flecha_ingenieria').tween('margin-left','20px'); });
	$('ingenieria_menu').addEvent('mouseleave',function(){ $('flecha_ingenieria').tween('margin-left','0px');});
	$('demoliciones_menu').addEvent('click',function(){ document.location.href='demoliciones-mecanicas-manuales.html'; });
	$('demoliciones_menu').addEvent('mouseenter',function(){ $('flecha_demoliciones').tween('margin-left','20px'); });
	$('demoliciones_menu').addEvent('mouseleave',function(){ $('flecha_demoliciones').tween('margin-left','0px'); });
	$('voladuras_menu').addEvent('click',function(){ document.location.href='voladuras-controladas.html'; });
	$('voladuras_menu').addEvent('mouseenter',function(){ $('flecha_voladuras').tween('margin-left','20px'); });
	$('voladuras_menu').addEvent('mouseleave',function(){ $('flecha_voladuras').tween('margin-left','0px'); });	 
	$('contacto_menu').addEvent('click',function(){ document.location.href='contacto-demoliciones-voladuras.html'; });
	$('contacto_menu').addEvent('mouseenter',function(){ $('flecha_contacto').tween('margin-left','20px'); });
	$('contacto_menu').addEvent('mouseleave',function(){ $('flecha_contacto').tween('margin-left','0px'); });
});
function rnd(inferior,superior){
	numPosibilidades = superior - inferior
	aleat = Math.random() * numPosibilidades
	aleat = Math.round(aleat)
	return parseInt(inferior) + aleat
} 
function toggle_pic(){
	idpic=lastidpic+1;
	if(idpic>npics) idpic=1;

	var nextidpic=idpic+1;
	if(nextidpic>npics) nextidpic=1;
	
	pic=lastpic+1;
	if(pic>maxpics) pic=1;
	
	lastidpic=idpic;
	lastpic=pic;
	
	if (pic<=9){
		pic='0'+pic;
	}
	var elemento='foto'+idpic;
	var elsiguente='foto'+nextidpic;
	var foto='./img/'+dir+pic+'.jpg';
	$(elsiguente).fade('out');
	$(elemento).src=foto;
	$(elemento).fade('in');
	setTimeout(toggle_pic,lapso);
}