title: javascript math, rounding to two decimal places in .05 increments
body: <p>I apologise in advance. I've read thru a number of post and I'm sure the answer lies in implementing the <code>toFixed()</code> method, but can't work out how. </p>
  
  <pre><code>$('.addsurcharge').click(function() {               
      $('span.depositamount').text(function(i,v) {
          return Math.round(parseInt(v * 100, 10) * 0.025) / 100 + (v * 1);
      });      
  });
  
  $('.nosurcharge').click(function() {            
      $('span.depositamount').text(function(i,v) {
          return Math.round(parseInt(v * 100, 10) * -0.025) / 100 + (v * 1);
      });      
  });
  </code></pre>
  
  <p>Basically, the above is adding (or subtracting) a 2.5% surcharge for AMEX deposits and I want it to round up to the nearest two decimal amount. Preferably in .05 increments. </p>
  
  <p>Help appreciated!</p>