Avoid Page Reload on Form submission

We can call Javascript function on ONSUMBIT event of Form to avoid page refreshing as

<form name="form1" onsubmit = "return alert_message()">
<input type="submit" name="Submit" value="Get Alert"/>
</form>

//My Javascrip function is as:

function alert_message()
{
  alert("Hello Rajesh");
  return false;
}