>     var distancevar = document.getElementById('distancevar');
>     this.set('distance', distancevar);

My guess was wrong ; you're supplying a complete HTML element instead
of a number.  Look into how to get the text value of an HTML element
http://www.javascript-coder.com/javascript-form/getelementbyid-form.phtml
and how to convert text to numbers
http://www.w3schools.com/jsref/jsref_parseFloat.asp

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