You need to compare the value of the current element with what is loaded.
var comp2;
var comp = $('completed_step'); //I'm assuming this refers to some value
if( comp != null || comp != "" ){
comp2 = load("/brew/completed_step");
}
if( comp != comp2 ){
comp = comp2;
}
Keep in mind, I'm not familiar with RightJS, so this might be wrong, but should give you the right idea.
Edit:
It looks like the Xhr module in rightJS takes an object that allows you to specify what to do when the process has completed.
http://rightjs.org/docs/xhr#load
Xhr.load('/some/url', {
onSuccess: function(request) {
// do something about it
}
});
That's from their example in the documentation.