Count the number of visitor, display on welcome page, limit only 1 for next

Hi everyone:
1.
This is my first problem
I m currently develop a web server, using tomcat, as a web container.
i have use strut by refer to Jakarta Struts for Dummies.
I have done a user registration, login verify from database MySQL.
My project is about telerobot, which will allow only 1 user to access the robot-control page.
My webpage now allow all the registered user to access to robot-control page. I wanted the page will stop all the user at welcome page, and display the client queuing, and will only allow the client access to control page when his/her turn. Accessing period is limited to 15 minutes, let say.
client =>
==>welcome page(display n queue and go to next page only when his/her turn)
==>robot-control page
please help ..please guide me
i) display the n client queued
ii.)allow only when his/her turn
2. My another problem is about the image. The webpage (jsp) may display the image for several time(properly), and then it may unable to retrieve the image.
Here is the code:
<%@ include file="taglibs.jsp" %>
<jsp:useBean id="now" class="java.util.Date" />
<table width="100%">
     <tr valign="top" align="center">
     <td>
<img src="images/logo.gif" name="jazz" width="533" height="98" border="0
<img src="images/cd.gif" name="jazz" width="140" height="140" border="0">
</td>
</tr>
</table>the logo.gif can't display after several time access to. A "X" marked on the left up corner instead of the logo.gif images. Please help ..
It will be okay if i replace it with other pictures ( new edited ) , but the old problem come on the next day (blank image). Please guide...
Thanks in advance !!

use a threaded application that is independent from your web app that will update your database every 15 minutes.. once a user has logged, the login time will be save on your db, thus it will be the reference time for your threaded application.. also put a tag on your db if the user has logged, the session has expired and if the user is his/her turn.. that is some idea that i can give you..

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