[jQuery] Plugin: How to access the ID in a Non-Objekt?

[Crazymind]

Example:

I call a function in a Plugin like this:
$("#someElement").jActual("update");

in the Plugin i do the following:
this.html("hello");

Thats no Problem, but how can I get the id (in this example:
someElement) of the Element if this not exist?

if(this.length <= 0){
    //how to give me the id of the NonObjekt?
}