Write a form to send a query to Google maps. If the input is not in the format of coordinates, display an error, clear the input, and ask the user to retry. For example, an incorrect input may look like 12.a2,21.22
1. You should define a function check() to check the query input.
2. You can call the function check as follows:form action="http://maps.google.com/maps" method="get" name="f" onsubmit="return check()"