diff --git a/ledger_pyreport/jinja2/index.html b/ledger_pyreport/jinja2/index.html
index 1200890..640de63 100644
--- a/ledger_pyreport/jinja2/index.html
+++ b/ledger_pyreport/jinja2/index.html
@@ -24,47 +24,47 @@
 	<ul>
 		<li><form action="{{ url_for('trial') }}">
 			<button type="submit">Trial balance</button>
-			<label>Date: <input name="date" value="{{ date.strftime('%Y-%m-%d') }}" style="width: 6em;" oninput="txtc(this)"></label>
-			<label>Period start: <input name="pstart" value="{{ pstart.strftime('%Y-%m-%d') }}" style="width: 6em;" oninput="txtc(this)"></label>
-			<label>Compare <input name="compare" value="0" style="width: 2em;" oninput="txtc(this)"> periods</label>
-			<label><input name="cash" type="checkbox" oninput="chbc(this)"> Cash basis</label>
+			<label>Date: <input name="date" data-inputgroup="date" value="{{ date.strftime('%Y-%m-%d') }}" style="width: 6em;" oninput="txtc(this)"></label>
+			<label>Period start: <input name="pstart" data-inputgroup="pstart" value="{{ pstart.strftime('%Y-%m-%d') }}" style="width: 6em;" oninput="txtc(this)"></label>
+			<label>Compare <input name="compare" data-inputgroup="compare" value="0" style="width: 2em;" oninput="txtc(this)"> periods</label>
+			<label><input name="cash" data-inputgroup="cash" type="checkbox" oninput="chbc(this)"> Cash basis</label>
 		</form></li>
 		
 		<li><form action="{{ url_for('balance') }}">
 			<button type="submit">Balance sheet</button>
-			<label>Date: <input name="date" value="{{ date.strftime('%Y-%m-%d') }}" style="width: 6em;" oninput="txtc(this)"></label>
-			<label>Period start: <input name="pstart" value="{{ pstart.strftime('%Y-%m-%d') }}" style="width: 6em;" oninput="txtc(this)"></label>
-			<label>Compare <input name="compare" value="0" style="width: 2em;" oninput="txtc(this)"> periods</label>
-			<label><input name="cash" type="checkbox" oninput="chbc(this)"> Cash basis</label>
+			<label>Date: <input name="date" data-inputgroup="date" value="{{ date.strftime('%Y-%m-%d') }}" style="width: 6em;" oninput="txtc(this)"></label>
+			<label>Period start: <input name="pstart" data-inputgroup="pstart" value="{{ pstart.strftime('%Y-%m-%d') }}" style="width: 6em;" oninput="txtc(this)"></label>
+			<label>Compare <input name="compare" data-inputgroup="compare" value="0" style="width: 2em;" oninput="txtc(this)"> periods</label>
+			<label><input name="cash" data-inputgroup="cash" type="checkbox" oninput="chbc(this)"> Cash basis</label>
 		</form></li>
 		
 		<li><form action="{{ url_for('pandl') }}">
 			<button type="submit">Income statement</button>
-			<label>Begin date: <input name="date_beg" value="{{ pstart.strftime('%Y-%m-%d') }}" style="width: 6em;" oninput="txtc(this)"></label>
-			<label>End date: <input name="date_end" value="{{ date.strftime('%Y-%m-%d') }}" style="width: 6em;" oninput="txtc(this)"></label>
-			<label>Compare <input name="compare" value="0" style="width: 2em;" oninput="txtc(this)"> periods</label>
-			<label><input name="cash" type="checkbox" oninput="chbc(this)"> Cash basis</label>
+			<label>Begin date: <input name="date_beg" data-inputgroup="pstart" value="{{ pstart.strftime('%Y-%m-%d') }}" style="width: 6em;" oninput="txtc(this)"></label>
+			<label>End date: <input name="date_end" data-inputgroup="date" value="{{ date.strftime('%Y-%m-%d') }}" style="width: 6em;" oninput="txtc(this)"></label>
+			<label>Compare <input name="compare" data-inputgroup="compare" value="0" style="width: 2em;" oninput="txtc(this)"> periods</label>
+			<label><input name="cash" data-inputgroup="cash" type="checkbox" oninput="chbc(this)"> Cash basis</label>
 		</form></li>
 		
 		<li><form action="{{ url_for('transactions') }}">
 			<button type="submit">General ledger</button>
-			<label>Date: <input name="date" value="{{ date.strftime('%Y-%m-%d') }}" style="width: 6em;" oninput="txtc(this)"></label>
+			<label>Date: <input name="date" data-inputgroup="date" value="{{ date.strftime('%Y-%m-%d') }}" style="width: 6em;" oninput="txtc(this)"></label>
 			<label>Period start: <input name="pstart" value="{{ pstart.strftime('%Y-%m-%d') }}" style="width: 6em;" oninput="txtc(this)"></label>
-			<label><input name="cash" type="checkbox" oninput="chbc(this)"> Cash basis</label>
+			<label><input name="cash" data-inputgroup="cash" type="checkbox" oninput="chbc(this)"> Cash basis</label>
 		</form></li>
 	</ul>
 	
 	<script>
 		// Called whenever a text input changes - update others to match
 		function txtc(el) {
-			for (var e2 of document.querySelectorAll('input[name="' + el.name + '"]')) {
+			for (var e2 of document.querySelectorAll('input[data-inputgroup="' + el.dataset['inputgroup'] + '"]')) {
 				e2.value = el.value;
 			}
 		}
 		
 		// Ditto for checkboxes
 		function chbc(el) {
-			for (var e2 of document.querySelectorAll('input[name="' + el.name + '"]')) {
+			for (var e2 of document.querySelectorAll('input[data-inputgroup="' + el.dataset['inputgroup'] + '"]')) {
 				e2.checked = el.checked;
 			}
 		}