redirect based upon cookie

not sure of the syntax to accomplish the following...

 

 

If ( HTTP Request is for http://someplace.com AND HTTP Request doesn’t have cookie X )

 

{

 

// Then Redirect to a hardcoded url like:

 

HTTP::redirect “http://someplace-else.com/some/path/somepage?param=value&param2=value2”

 

}

 

 

not sure how to determine if a cookie does NOT exist.