‘onChange’ Event
 <hr><br>
   Adding a smile to <input type="text" name="x2" size=2
   onChange="x5.value = x2.value + ')' "><br>
   Adding a wink to <input type="text" name="x3" size=2
   onChange="x5.value = ';' + x3.value"><br>
   Adding a frown to <input type="text" name="x4" size=2
   onChange="x5.value = x4.value + '(' "><br>
   Makes <input type="text" name="x5"  size=3>
* Notice
names
+ is concatenate