Javascript to Sum Decimal Numbers

 <script type="text/javascript">
                function addNumbers()
                {
                        var val1 = parseInt(document.getElementById("timepicker").value);
                        var val2 = parseInt(document.getElementById("timepicker2").value);
                        var ansD = document.getElementById("answer");
                        ansD.value = val2 - val1;
                }
        </script>

<input type="button" name="Sumbit" value="Click here to calculate Time Spent" onclick="javascript:addNumbers()"/>
        Answer = <input type="text" id="answer" name="answer" value=""/>

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The above code works for me when I use integers but how do I set it to be able to use decimal numbers as inputs from the textboxes and give the result as decimal