title: How do I format a number to 2 decimal places, but only if there are already decimals?
body: <p>I have a jQuery 1.5+ script, and you select a quantity in a drop-down menu (1,2,3, etc) and it multiplies that quantity by $1.50 to show you a total price. Basically - it's multiplying the quantity selected (1, 2, 3, etc) by the base price of $1.50 - BUT - I can't figure out how to display the price correctly with decimals - example: if you select a quantity of 2, the price displays correctly as $3 (no decimals). But, if you choose 1, or 3, the price displays as $1.5 / $4.5 - missing a 0 in the hundredths decimal place.</p>
  
  <p>Here's the code - any idea how to show a second 0 in the case that there are not already two decimals? $3 should stay as $3, but $4.5 should become $4.50, etc - I can't get it to work without showing ALL numbers to two decimals, and that's where I'm stuck!</p>
  
  <pre><code>&lt;script type='text/javascript'&gt;     
      $(function() {         
          $('#myQuantity').change(function() {             
              var x = $(this).val();                      
              $('#myAmount').text('$'+(x*1.5));// this is the part that isn't displaying decimals correctly!
          });     
      }); 
  &lt;/script&gt;
  </code></pre>
  
  <p>I'm experimenting with something like result = num.toFixed(2); but can't get it to work yet.</p>
  
  <p>Thank you Kindly!</p>