<!-- ONE STEP TO INSTALL BASIC CALCULATOR:
 
   1.  Paste the coding into the BODY of your HTML document  -->
 
<!--  STEP ONE: Copy this code into the BODY of your HTML document  -->
<form>
 
<!-- This script and many more are available free online at -->
<!-- The JavaScript Source!! http://javascript.internet.com -->
<table border="4">
<tbody>
<tr>
<td>
<input name="Input" size="16" type="text" /></td>
</tr>
<tr>
<td>
<input onclick="Calc.Input.value += '1'" name="one" type="button" value="  1  " />
<input onclick="Calc.Input.value += '2'" name="two" type="button" value="  2  " />
<input onclick="Calc.Input.value += '3'" name="three" type="button" value="  3  " />
<input onclick="Calc.Input.value += ' + '" name="plus" type="button" value="  +  " />
<input onclick="Calc.Input.value += '4'" name="four" type="button" value="  4  " />
<input onclick="Calc.Input.value += '5'" name="five" type="button" value="  5  " />
<input onclick="Calc.Input.value += '6'" name="six" type="button" value="  6  " />
<input onclick="Calc.Input.value += ' - '" name="minus" type="button" value="  -  " />
<input onclick="Calc.Input.value += '7'" name="seven" type="button" value="  7  " />
<input onclick="Calc.Input.value += '8'" name="eight" type="button" value="  8  " />
<input onclick="Calc.Input.value += '9'" name="nine" type="button" value="  9  " />
<input onclick="Calc.Input.value += ' * '" name="times" type="button" value="  x  " />
<input onclick="Calc.Input.value = ''" name="clear" type="button" value="  c  " />
<input onclick="Calc.Input.value += '0'" name="zero" type="button" value="  0  " />
<input onclick="Calc.Input.value = eval(Calc.Input.value)" name="DoIt" type="button" value="  =  " />
<input onclick="Calc.Input.value += ' / '" name="div" type="button" value="  /  " /></td>
</tr>
</tbody></table>
</form>