ajax validation before clicking submit button

[malatamil]

validation for particular fields like input name="",textarea,select name="".

   <form method="post" id="myform" name="myform">
 <tr><td width="170"><div align="left">Company Name<span style="color:#F00;">*</span> :</div></td><td width="317"> <input type="text" name="companyname" placeholder="Company Name" value="<?php echo ucwords(strtolower(mysql_real_escape_string($_POST['companyname']))); ?>"/></td></tr>
        <tr><td><div align="left">Contact Person Name<span style="color:#F00;">*</span> :</div></td><td> <input type="text" name="conactperson" placeholder="Contact Person Name" value="<?php echo ucwords(strtolower(mysql_real_escape_string($_POST['conactperson']))); ?>"/></td>
        </tr>
        </form>

company name is mandatory but if i go to next fields i want to display one message near that companyame text box. am searching for this still not getting.if anyone knows about this validation please help me.

[pritaeas]

http://jqueryvalidation.org

[malatamil]

thank you.. before clicking submit button validation method i want if that field is mandatory.