function array_diff_key( object ) {	// Computes the difference of arrays using keys for comparison
	// 
	// +   original by: Ates Goral (http://magnetiq.com)

	var tpm_ar = new Object(), argc = arguments.length, argv = arguments, key, argidx, other;

	for (key in object) {
		tpm_ar[key] = object[key];
	}
	for (argidx = 1; argidx < argc; ++argidx) {
		other = argv[argidx];

		if (other instanceof Object) {
			for (key in other) {
				delete tpm_ar[key];
			}
		}
	}

	return tpm_ar;
}