To stay on the current page on submitting page but should display new items PHP

I have a page called file.php, it has a form in it, but when the page is submitted it should stay on this page itself and the form should not be shown, instead it should display a message "Welcome".

The sample code is

    <form name="fn" method="post" action="postib.php">
   <table align="center" border="1" >

 <TR><TD>Job Title</TD><TD><input type="text" name="jobtitle"/></TD></TR>开发者_如何学编程
    <TR><TD>Job Description</TD><TD><input type="textarea" name="jobdescription"/></TD></TR>
         <TR><TD>Location</TD><TD><select name="locid" id="locid" size="1"     style="width:190px;" onchange="showsub();"><option value="1" title="Any Location">Any    Location</option>
         <input type="submit">

Create a hidden iframe:

<iframe id="my_hidden_iframe" style="display:none;></iframe>

Then set the target of your form to this iframe and set an onSubmit for the form:

<form id="my_form" target="my_hidden_iframe" onSubmit="submit_form_function();">

Create a welcome message div that is hidden by default:

<div id="my_welcome_message" style="display: none;">Welcome...</div>

Then have the submit_form_function() hide the form and add a welcome message:

function submit_form_function() {
    $('#my_form').hide();
    $('#my_welcome_message').show();
}

The above code uses JQuery, you can also do this without a JS library:

function submit_form_function() {
    document.getElementById('my_form').style.display = 'none';
    document.getElementById('my_welcome_message').style.display = 'block';
}