<table>
  <tr>
    <td onclick='nuAddToFormula(event)'  class='nuCalculatorButton'>1</td>
    <td onclick='nuAddToFormula(event)'  class='nuCalculatorButton'>2</td> 
    <td onclick='nuAddToFormula(event)'  class='nuCalculatorButton'>3</td> 
    <td onclick='nuAddToFormula(event)'  class='nuCalculatorButton' title='Add a Space'> </td> 
    <td onclick='nuAddToFormula(event)'  class='nuCalculatorButton'> + </td>
  </tr>
  <tr>
    <td onclick='nuAddToFormula(event)'  class='nuCalculatorButton'>4</td>
    <td onclick='nuAddToFormula(event)'  class='nuCalculatorButton'>5</td> 
    <td onclick='nuAddToFormula(event)'  class='nuCalculatorButton'>6</td> 
    <td onclick='nuAddToFormula(event)'  class='nuCalculatorButton'>.</td> 
    <td onclick='nuAddToFormula(event)'  class='nuCalculatorButton'> - </td> 
  </tr>
  <tr>
    <td onclick='nuAddToFormula(event)'  class='nuCalculatorButton'>7</td>
    <td onclick='nuAddToFormula(event)'  class='nuCalculatorButton'>8</td> 
    <td onclick='nuAddToFormula(event)'  class='nuCalculatorButton'>9</td> 
    <td onclick='nuAddToFormula(event)'  class='nuCalculatorButton'>0</td>
    <td onclick='nuAddToFormula(event)'  class='nuCalculatorButton'> * </td>
  </tr>
  <tr>
    <td onclick='nuAddToFormula(event)'  class='nuCalculatorButton'> ? </td>
    <td onclick='nuAddToFormula(event)'  class='nuCalculatorButton'> : </td> 
    <td onclick='nuAddToFormula(event)'  class='nuCalculatorButton'> = </td> 
    <td onclick='nuAddToFormula(event)'  class='nuCalculatorButton'> ! </td> 
    <td onclick='nuAddToFormula(event)'  class='nuCalculatorButton'> / </td>
  </tr>
  <tr>
    <td onclick='nuAddToFormula(event)'  class='nuCalculatorButton'> ( </td>
    <td onclick='nuAddToFormula(event)'  class='nuCalculatorButton'> ) </td>
    <td onclick='nuAddToFormula(event)'  class='nuCalculatorButton' colspan=3>Clear</td>
  </tr>
  <tr>
    <td onclick='nuAddToFormula(event)'  class='nuCalculatorButton' colspan=5> Math.round( </td>
  </tr>
</table>