Prevent access to a visitors

Hi,

I have a menu that has images and onclick event to go to a page.  

how can I do this:

If the user is not a member I need to send them an alert ("this feature is for members only") and prevent them from accessing the page otherwise, they will access the page.

Once the user login a cookie is created to identify the user ID and name

that's user ID cookie
(MemUserID)

User Name cookie
(MemUser)

I need this feature for the following images/menu only:
PostAd.cfm
Post.cfm

the rest of my pages anyone can access.


here's my menu.

<img style="cursor:hand;" src="images/BThome1.gif" alt="" border="0" onClick="parent.location='home.cfm';">

<img style="cursor:hand;"  src="images/BTMyAcc2.gif" alt="" border="0" onClick="parent.location='MyAcc.cfm';">

<img style="cursor:hand;"  src="images/BTPostAd1.gif" alt="" border="0" onClick="parent.location='PostAd.cfm';">

<img style="cursor:hand;"  src="images/BTSearch1.gif" alt="" border="0" onClick="parent.location='post.cfm';">

<img style="cursor:hand;"  src="images/BTChat1.gif" alt="" border="0" onClick="parent.location='Chat.cfm';">

<img style="cursor:hand;" src="images/BTHelp1.gif" alt="" border="0" onClick="parent.location='Help.cfm';">

<img style="cursor:hand;"  src="images/BTContactUs1.gif" alt="" border="0" onClick="parent.location='ContactUs.cfm';">


Thanks,
lulu50Asked:
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bartvdConnect With a Mentor Commented:
Hey,

It is not safe to do this in javascript. You should do this in a scripting language.
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lulu50Author Commented:
I agree thanks
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