[jQuery] How to save "this" context in callbacks

[jQuery] How to save "this" context in callbacks


Goodday!
Could anyone tell me how to save "this" context inside callback?
Here is simple example:
var myClass = jQuery.Class.create({
    init: function(){
        this.value = "value";
        // callback as argument:
        someExternalFunction( function() {
                this.setValue(); // PROBLEM: "this" is not myClass pointer
anymore!
            } );
    },
    setValue: function () {
        this.title = "new value";
    }
});