var Picture = new Array(); 
var Description = new Array(); 
var jss = 1;
var pss = 13;

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';
Picture[10]  = '10.jpg';
Picture[11]  = '11.jpg';
Picture[12]  = '12.jpg';
Picture[13]  = '13.jpg';

Description[1]  = "2003<br /><span class='testo17'><em><strong>cono</strong></em></span><strong><br />h9<br />bronzo</strong>";
Description[2]  = "2003<br /><span class='testo17'><em><strong>cono</strong></em></span><strong><br />h9<br />bronzo</strong>";
Description[3]  = "2003<br /><span class='testo17'><em><strong>cono</strong></em></span><strong><br />h9<br />bronzo</strong>";
Description[4]  = "2003<br /><span class='testo17'><em><strong>cono</strong></em></span><strong><br />h9<br />bronzo</strong>";
Description[5]  = "2003<br /><span class='testo17'><em><strong>cono</strong></em></span><strong><br />h9<br />bronzo</strong>";
Description[6]  = "2003<br /><span class='testo17'><em><strong>cono</strong></em></span><strong><br />h9<br />bronzo</strong>";
Description[7]  = "2003<br /><span class='testo17'><em><strong>cono</strong></em></span><strong><br />h9<br />bronzo</strong>";
Description[8]  = "2003<br /><span class='testo17'><em><strong>cono</strong></em></span><strong><br />h9<br />bronzo</strong>";
Description[9]  = "2003<br /><span class='testo17'><em><strong>cono</strong></em></span><strong><br />h9<br />bronzo</strong>";
Description[10]  = "2003<br /><span class='testo17'><em><strong>cono</strong></em></span><strong><br />h9<br />bronzo</strong>";
Description[11]  = "2003<br /><span class='testo17'><em><strong>cono</strong></em></span><strong><br />h9<br />bronzo</strong>";
Description[12]  = "2003<br /><span class='testo17'><em><strong>cono</strong></em></span><strong><br />h9<br />bronzo</strong>";
Description[13]  = "2003<br /><span class='testo17'><em><strong>cono</strong></em></span><strong><br />h9<br />bronzo</strong>";

function swap(id) {
 	document.getElementById('immagine').src = 'img/opere1/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);
}