простой калькулятор

[megagagaga]

<form>
  <input type="button" value="c" onClick="calc.display.value = ''">
  <input type="text" name="display">
  <input type="button"value="1" onClick="calc.display.value ±='1'"> 
  <input type="button"value="="onClick="calc.display.value=eval(calc.display.value)">
</form>

[megagagaga]

<form name="calc">
  <input type="button" value="c" onClick="calc.display.value = ''">
  <input type="text" name="display">
  <input type="button"value="1" onClick="calc.display.value ±='1'"> 
  <input type="button"value="="onClick="calc.display.value=eval(calc.display.value)">
</form>

[рони]

megagagaga,