section_actual=1;

function change_menu(section){
	if(section_actual==1)section_fade="intro";
	if(section_actual==2)section_fade="expo";
	if(section_actual==3)section_fade="tecnica";
	if(section_actual==4)section_fade="venta";
	if(section_actual==5)section_fade="contacto";
	
	if(section==1){
		new Effect.Fade(section_fade,{duration: 1,afterFinish: show_1});
		section_actual=1;
	}
	if(section==2){
		new Effect.Fade(section_fade,{duration: 1,afterFinish: show_2});
		section_actual=2;
	}
	if(section==3){
		new Effect.Fade(section_fade,{duration: 1,afterFinish: show_3});
		section_actual=3;
	}
	if(section==4){
		new Effect.Fade(section_fade,{duration: 1,afterFinish: show_4});
		section_actual=4;
	}
	if(section==5){
		new Effect.Fade(section_fade,{duration: 1,afterFinish: show_5});
		section_actual=5;
	}
}
function show_1(){
	new Effect.Appear('intro',{duration: 1});
}
function show_2(){
	new Effect.Appear('expo',{duration: 1});
}
function show_3(){
	new Effect.Appear('tecnica',{duration: 1});
}
function show_4(){
	new Effect.Appear('venta',{duration: 1});
}
function show_5(){
	new Effect.Appear('contacto',{duration: 1});
}