function ajax_reguest(div,url)
{
new Ajax.Updater(div,url, { 
method: 'get',
requestHeaders: {'If-Modified-Since' : 'Sat, 1 Jan 2000 00:00:00 GMT'}
 });
}

function SetZone (z)
{
var r = "zone" + z;
$('price').innerHTML=eval(r);
$('zonename').innerHTML=zn[z];
$('price_f').value=eval(r);
$('zonename_f').value=zn[z];
}