There is a typo at http://processing.org/reference/loadImage_.html

The third example is as follows:

PImage online;

void setup() {
 String url = "http://mt0.google.com/mt?n=404&v=w2.61&x=9913&y=12119&zoom=2";
 online = loadImage(url, "png");
 noLoop();
}

void draw() {
 image(b, 0, 0);
}


where it shall read:

PImage online;

void setup() {
 String url = "http://mt0.google.com/mt?n=404&v=w2.61&x=9913&y=12119&zoom=2";
 online = loadImage(url, "png");
 noLoop();
}

void draw() {
 image(online, 0, 0);
}

Note: the change required is in draw() as "b" as the PImage variable name appears to have been copy-pasted from the two preceding examples.

HTH,

Pierre