[Solved] how to use ajax in plugin admin area?

sun Asks: how to use ajax in plugin admin area?
I tried ajax to get some info a php inside my plugin.but getting error-call to undefined function. Ajax

        type: "POST",
        url: "<?php echo plugins_url();?>/tester/inc/test.php",
        data: { param: 'st1' }
      }).done(function( msg ) {
             alert( "Data Saved: " + msg );

Error in alert

Data Saved: <br />
<font size='1'><table class='xdebug-error xe-fatal-error' dir='ltr' border='1' cellspacing='0' cellpadding='1'>
<tr><th align='left' bgcolor='#f57900' colspan="5"><span style='background-color: #cc0000; color: #fce94f; font-size: x-large;'>( ! )</span> Fatal error: Call to undefined function add_action() in E:wamp1wampwwwwp_twentythirteenwp-contentpluginstesterinctest.php on line <i>7</i></th></tr>
<tr><th align='left' bgcolor='#e9b96e' colspan='5'>Call Stack</th></tr>
<tr><th align='center' bgcolor='#eeeeec'>#</th><th align='left' bgcolor='#eeeeec'>Time</th><th align='left' bgcolor='#eeeeec'>Memory</th><th align='left' bgcolor='#eeeeec'>Function</th><th align='left' bgcolor='#eeeeec'>Location</th></tr>
<tr><td bgcolor='#eeeeec' align='center'>1</td><td bgcolor='#eeeeec' align='center'>0.0007</td><td bgcolor='#eeeeec' align='right'>254944</td><td bgcolor='#eeeeec'>{main}(  )</td><td title='E:wamp1wampwwwwp_twentythirteenwp-contentpluginstesterinctest.php' bgcolor='#eeeeec'>..test.php<b>:</b>0</td></tr>


function aj()
 echo "hello";
echo plugins_url();


i think the error denote like am not inside wordpress. Any idea?

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