var pic1 = "/otv/common/img/carto/carte_euro.gif";         /* Copy and paste if you want more pictures in your gallery i.e 'var pic4 = "apa.jpg"' aso. */
var pic2 = "/otv/common/img/carto/carto_suisse.gif";
var pic3 = "/otv/common/img/carto/carto_region.gif";
var number = 3 ;            /* Number of pictures in your intended gallery */
var vart = 1 ;              /* Control variable, set to 1 just to know where it is */


function next() 
{ 
if (vart == number)
 document.gallery.src = eval("pic" + vart);

else
vart = vart + 1;
 document.gallery.src = eval("pic" + vart);
}


function previous() 
{
if (vart == 1) 
 document.gallery.src = eval("pic" + vart);

else
vart = vart - 1;
 document.gallery.src = eval("pic" + vart);
}