override-xhr.js

(function() {

	dojo.xhrGet = function(/*dojo.__XhrArgs*/ args){
        // first clone so we don't screw up original caller
        var cloneargs = dojo.mixin( {}, args );
        if (cloneargs.url) {
           cloneargs.url = 'myfunkyurl?a=' + cloneargs.url;
        }
		return dojo.xhr("GET", cloneargs);
	};

})();