Replace dot with comma

We have a requirement in our web application to replace the dot pressed in the Numeric pad, with comma. I 've searched in the internet for a solution for this and could not find one.
Hence I had to find the following solution. (Works only in IE browser)

var dotReplace = false;
function keypressEvent(the_key) {
 if(the_key == 46 && dotReplace) {
  event.keyCode = 44;
 }
}
function keydownEvent(the_key) {
 if(the_key == 110) {
   dotReplace = true;
 } else {
  dotReplace = false;
 }
}

And in the form call the above functions for respective events.

<input name="disp" type="text" 
onkeypress="keypressEvent(event.keyCode)" 
onkeydown="keydownEvent(event.keyCode)">

Working Example:
Type a dot from the numeric pad here: