var letPrices = [100, 150, 200, 250,300,350,400,450,500,750, 1000, 1250, 1500];
selectInstructionType.format.let = "£%%price%%pw";
var it_cb = function(type) {
	new Ajax.Request("/fetch-towns.html", {
		parameters: {
			it: type
		},
		onSuccess: function(t) {
			var data = eval('('+t.responseText+')');
			var el = $("town");
			var f = $F(el);
			el.options.length = 0;
			el.options[el.options.length] = new Option("-- Select --", "");
			data.each(function(town, n) {
				var o = new Option(town);
				el.options[el.options.length] = o;
				if (f == town)
					el.options.selectedIndex = n+1;
			});
		}
	});
}