How can i call the function through ajax

<strong>reset.php file:</strong>

<?php
        add_action('admin_init','popup_template_reset_options');

        function popup_template_reset_options()
        	{
        	delete_option('popup_template_on');
        	delete_option('popup_template_close');
        	delete_option('popup_template_escape');
        	delete_option('popup_template_external');
        	delete_option('popup_template_home_page');
        	delete_option('popup_template_all_pages');
        	delete_option('popup_template_template');
        	delete_option('popup_cookies_display_after_like');
        	add_option('popup_cookies_display_after_like','365');
        	//add_option('popup_template_on','1');
        	add_option('popup_template_close','1');
        	add_option('popup_template_escape','1');
        	add_option('popup_template_external','1');
        	add_option('popup_template_force_timer','2');
        	add_option('popup_template_home_page','1');
        	add_option('popup_template_all_pages','1');
        	add_option('popup_template_template','2');

        }
        ?>
Script Ajax:
<script type="text/javascript">
        		$(document).ready(function() {
        $('#reset_general').click(function()
        {
        $('#result1').css("display","block");
        jQuery('#result1').animate({'opacity':'1'});

        });
        });
        function resetgeneral() {
            $.ajax({type:'POST', url: '<?php echo WP_PLUGIN_URL;?>/fantasticpopuptemplate/inc/reset.php',success: function(response) {

                //$('#fff').find('.form_result').html(response);
        		$('#result1').css("display","none");
        		$('#resets1').css("display","block");
        		$('#resets1').html("Settings Resets");
        		$('#resets1').fadeOut(2500, "linear");
            }});

            return false;
        }

        </script>
     <form onsubmit="return resetgeneral();" id="form_general_reset" class="form-1">
                   <input type="submit" value="Reset" id="reset_general" name="reset" class="button-secondary"/>
                   <input name="action" type="hidden" value="reset" />

                   </form>

Hi i trying to call the php reset function in ajax but when i googling i know that not possibilities of direct calling php function so I put that particular function in seperate php file and call that php file i am not sure how can i do this in ajax i tried this above code but nothing happen. Settings Resets Message appear. How Can I do this Any Help would be great. Before using the ajax concept i tried with isset function in php But it getting page load every time for that only i jump into the ajax.