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Checkbox onFocus

Syntax onFocus="command" The onFocus event handler is defined in an tag and specifies what to do when a check box gains focus. <html>     <form name="orderForm">       <input type="checkbox"              name="peppers">Peppers<br>       <input type="checkbox"              name="sausage"              onFocus="chooseExtraCheese()">Sausage<br>       <input type="checkbox"              name="cheese">Extra Cheese<hr>       <input type="button"              value="Order Pizza"              name="orderButton"              onClick="alert('ordered.')">     </form>     <script language="JavaScript">     <!--     function chooseExtraCheese()     {       if(document.orderForm.sausage.checked == false)       {         document.orderForm.cheese.checked = true;       }     }     document.write("checkbox onFocus event handler: ");     document.write(document.orderForm.sausage.onFocus);     -->     </script>     </html>