deleting session variables

[S R]

Hi,

I am using this code to delete my session variables when a user closes their 
browser:

        <cfif IsDefined("Cookie.CFID") AND IsDefined("Cookie.CFTOKEN")>
        <cfset cfid_local = Cookie.CFID>
    <cfset cftoken_local = Cookie.CFTOKEN>
    <cfcookie name="CFID" value="#cfid_local#">
    <cfcookie name="CFTOKEN" value="#cftoken_local#">
        </cfif>

The only problem is that it also deletes my client variables upon closing 
the browser. Is there any way to just delete session variables and leave the 
client intact??

Sal
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