function setimg(id) {
	if (id<5 && id>0)
	{
	var txt = Array('Av1353.html', 'de1353a1362.html', 'de1362a1649.html', 'de1649a1973.html');
	var img = '';
	img = document.getElementById('imghisto');
	img.src = 'ImageHistoire/histo_0' + id + '.gif';
	lnk = document.getElementById('lnkimghisto');
	lnk.href = "dates/" + txt[id-1] + "#top";
	return true;
	} else {
		return false;
	}
}