var BOX_ID = 'donations^Band Trip';
var TIX_PRICE = 1400;
var PRICE_TXT = '1,400 per attendee: ';
var NUM_TIX = 3;
function on_load(page) {
	if (page == 'selections_page') {
		showTicketSelections();
	}
}
// replaces donation box with ticket selection menu
function showTicketSelections() {
	// hide donation box
	var box = document.getElementById(BOX_ID);
	box.style.display = "none";
	var td = box.parentNode;
	var txt = document.createTextNode(PRICE_TXT);
	td.appendChild(txt);
	var sel = document.createElement('select');
	sel.onchange = function() { setAmount(this.value); };
	for (i=0;i<=NUM_TIX;i++) {
		var opt = document.createElement('option');
		txt = document.createTextNode(i);
		opt.appendChild(txt);
		opt.setAttribute('value',i);
		sel.appendChild(opt);
	}
	td.appendChild(sel);
}
// sets price based on ticket selection
function setAmount(number) {
	var amount = number * TIX_PRICE;
	document.getElementById(BOX_ID).value = amount;
}