var Picture = new Array(); 
var Description = new Array(); 
var jss = 1;
var pss = 11;

Picture[1]  = '01.jpg';
Picture[2]  = '02.jpg';
Picture[3]  = '03.jpg';
Picture[4]  = '04.jpg';
Picture[5]  = '05.jpg';
Picture[6]  = '06.jpg';
Picture[7]  = '07.jpg';
Picture[8]  = '08.jpg';
Picture[9]  = '09.jpg';

Description[1]  = "<span class='testo17'><strong>Acqua:</strong></span><br />la musica<br />del giardino";
Description[2]  = "<span class='testo17'><strong>Acqua:</strong></span><br />la musica<br />del giardino";
Description[3]  = "<span class='testo17'><strong>Acqua:</strong></span><br />la musica<br />del giardino";
Description[4]  = "<span class='testo17'><strong>Acqua:</strong></span><br />la musica<br />del giardino";
Description[5]  = "<span class='testo17'><strong>Acqua:</strong></span><br />la musica<br />del giardino";
Description[6]  = "<span class='testo17'><strong>Acqua:</strong></span><br />la musica<br />del giardino";
Description[7]  = "<span class='testo17'><strong>Acqua:</strong></span><br />la musica<br />del giardino";
Description[8]  = "<span class='testo17'><strong>Acqua:</strong></span><br />la musica<br />del giardino";
Description[9]  = "<span class='testo17'><strong>Acqua:</strong></span><br />la musica<br />del giardino";

function swap(id) {
 	document.getElementById('immagine').src = 'img/acqua_poesie/grandi/'+Picture[id];
	document.getElementById('dettaglio').innerHTML = Description[id];
	jss = id;
}

function control(how){
if (how=="F") jss = jss + 1;
if (how=="B") jss = jss - 1;
if (jss > (pss)) jss=1;
if (jss < 1) jss = pss;
swap(jss);
}