title: Function to math library not being called
body: <p>I need to get the square root of a large number, with precision, using javascript.</p>
  
  <p>I've found this library BigNum which uses another called BigInteger, found here:
  <a href="http://john-edwin-tobey.org/Scheme/javascript-bignum/docs/files/schemeNumber-js.html#SchemeNumber.fn" rel="nofollow">http://john-edwin-tobey.org/Scheme/javascript-bignum/docs/files/schemeNumber-js.html#SchemeNumber.fn</a>
  and here:
  <a href="http://silentmatt.com/biginteger-docs/files/biginteger-js.html" rel="nofollow">http://silentmatt.com/biginteger-docs/files/biginteger-js.html</a></p>
  
  <p>Trying it out with jsfiddle, my call to a BigIntiger function <code>document.write(BigInteger(4).multiply(3));</code> works fine, but my call to a Bignum function <code>document.write(fn.sqrt(16));​</code> does not work.</p>
  
  <p>Any ideas why?</p>
  
  <p>Here's the fiddle:
  <a href="http://jsfiddle.net/tKxL6/3/" rel="nofollow">http://jsfiddle.net/tKxL6/3/</a></p>
  
  <p>Thanks!</p>