update the value of a cookie via an ajax request

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Perl

Ajax

How can i update the value of a cookie for my localhost application ...

I am trying to update via an ajax request but its creating two cookies..
this is the php code iam using..

$sessionManifestName = "manifest_".md5( time() ).".xml";		
		
if( isset ( $_COOKIE["TMP_MANIFEST"] ) ){
	setcookie( "TMP_MANIFEST", "", time()-3600, "/"  ) ;
}

setcookie( "TMP_MANIFEST", $sessionManifestName, time()+3600 , "/"  ) ;

But it creates two cookies with the same in different directories with different values..

from the root... i have one cookie but they are two in the dir which contains this script.

that is..
in ./ i have one TMP_MANIFEST but
in ./myapp/controller - i have two TMP_MANIFEST cookies with different values.

How can i fix this?