Sorry if this has been covered before, i can't imagine it hasn't, but 
i've been unable to find any information on it.

Can i pass my own parameters to the onComplete function specified by 
Ajax.Request ?

My basic setup is i have an html element triggering an event (the ajax 
update).
I have additional information encoded into the element about how it 
should handle different response codes returned from the ajax event.
The problem is, i havn't figured out a way to specify the id of my 
element to be passed along to the onComplete function, so right now i 
just stick it in a global js variable before the ajax call and then look 
it up in my on Complete function, but thats pretty hacky.

I suppose i can pass the elementId as a param to my ajax call, and have 
the responder return it as part of the response codes, but that seems 
kinda weak as well.

Is there no way to keep my current context when the ajax onComplete 
function is triggered?

Here's my trimmed down code sample:
-----------------------------------
//global reference to the element invoking the action
var NamedActionElement;

function NamedActionHandler(theElement)
{
        //set our global reference to the element so we can access it in later 
functions
        //since ajax calls take us to other functions and we can't seem to pass 
it along
        NamedActionElement = theElement;

//skip setting up my vars for the ajax call

        //make the ajax call
        var ajaxCall = new Ajax.Request( urlCall,
                {method: 'post',
                postBody: postFormData,
                onComplete: NamedActionResponseHandler}
        );
}

function NamedActionResponseHandler(theResponse)
{
        var elementThatTriggeredEvent = NamedActionElement;

//do stuff based on values i have encoded into the element and
//the data returned in theResponse
}

----------------------

As you can see, i have to have this global variable so my onComplete 
function can know which element triggered the event.
Is there a way to pass my own argument to the onComplete function?

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