How can I call ajax when I click a button in aem programmatically?

Please check

Server side - Adobe Experience Manager Help | Invoking Adobe Experience Manager Sling Servlets using Apache HTTP APIs

Client side - CQ5 CMS Blog | Adobe Experience Manager blog : How to call Servlet using ajax calling in cq5

http://api.jquery.com/jquery.ajax/

Thank you for reply.

I have another question.

When I click [Post to servlet],

val1 is undefined.

test.html

        <form>

                    Value1:<input type="text" id="v1" name="v1" value="AL" />

                    Value2:<input type="text" id="v2" name="v2" value="OA" />

                    <input type="submit" class="perform" value="Post to servlet!!!"/>

                </form>

test.js

$(".perform" ).click(function() {

    var val1=$('v1').val();

    var val2=$('v2').val();

    alert("val1 : " + val1);

    alert("val2 : " + val2);

    //Use JQuery AJAX request to post data to a Sling Servlet

    $.ajax({

        type: 'POST',

        url:'/bin/imgcounter',

        data:{'value1' : val1,'value2' : val2},          //passing values to servlet

        success: function(msg){

            //Success logic here(The response from servlet)

        }

    });

    location.reload();

});

Can you check my source what is wrong?