diff --git a/kole.html b/kole.html
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+++ b/kole.html
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+<!DOCTYPE html>
+<html>
+<head>
+<style>
+	input[type='number']{text-align:right;}
+</style>
+</head>
+<body>
+	<p>Bei Eingaben werden Komma und Punkt als Dezimaltrennzeichen betrachtet.</p>
+	<table>
+		<tr><td>Berechne:</td><td><input type="radio" name="b" value="k" id="bk" class="bb" checked="checked" /><label for="bk">KoLe</label><input type="radio" name="b" value="e" id="be" class="bb" /><label for="be">Einnahmen</label></td></tr>
+		<tr><td>Einnahme</td><td><input type="number" step="0.01" id="e" value="1"/> €</td></tr>
+		<tr><td>Umsatzsteuer</td><td><input type="number" step="0.01" id="u" value="19"/> %</td></tr>
+		<tr><td>Entropieumlage</td><td><input type="number" step="0.01" id="z" value="23"/> %</td></tr>
+		<tr><td>KoLe</td><td><input type="number" step="0.01" id="k" value=""/> €</td></tr>
+		<tr><td>&nbsp;</td><td><input value="Berechnen" id="b" type="button"/></td></tr>
+	</table>
+	<script>
+		var e=document.getElementById('e');
+		var u=document.getElementById('u');
+		var z=document.getElementById('z');
+		var k=document.getElementById('k');
+		var bk=document.getElementById('bk'); 
+		var be=document.getElementById('be'); 
+		var b = document.getElementById("b");
+
+		b.addEventListener("click", function(){
+			if(bk.checked){
+				k.value = Math.round( parseFloat(e.value.replace(/,/g, '.')) / ( 1 + parseFloat(u.value.replace(/,/g, '.')) / 100 ) * ( 1 - parseFloat(z.value.replace(/,/g, '.')) / 100 ) * 100 ) / 100;
+			}else// if(be.checked)
+			{
+				e.value = Math.round( parseFloat(k.value.replace(/,/g, '.')) * ( 1 + parseFloat(u.value.replace(/,/g, '.')) / 100 ) / ( 1 - parseFloat(z.value.replace(/,/g, '.')) / 100 ) * 100 ) / 100;
+			}
+		});
+	</script>
+</body>
+</html>

Berechne:	KoLeEinnahmen
Einnahme	€
Umsatzsteuer	%
Entropieumlage	%
KoLe	€