Only set the grid stack cookie if it hasn't been set before. This fixes a problem when multiple browser sessions are open from the same client which causes the cookie size to grow exponentially [submitted by: <Matt Ryan mryan novell.com]
Only set the grid stack cookie if it hasn't been set before. This fixes a problem when multiple browser sessions are open from the same client which causes the cookie size to grow exponentially [submitted by: <Matt Ryan mryan novell.com]

git-svn-id: 27e0aca8c7a52a9ae65dfba2e16879604119af8c@789 93a4e39c-3214-0410-bb16-828d8e3bcd0f

fastly/ganglia,fastly/ganglia,fastly/ganglia,fastly/ganglia,fastly/ganglia