Using CapacitiveSensor.h with analog pins

Hey,

I wanted to use a Capacitive Sensor like in the example:

http://playground.arduino.cc//Main/CapacitiveSensor?from=Main.CapSense

Cause all of my digital pins except D2 are all being used, I deceided to use A0-A2 as receive pins and D2 as send pin . It doesn't work. As I can see the library uses only digital pins. So, my question is, what can I do if I want to use analog Pins

#include <CapacitiveSensor.h>

CapacitiveSensor   cs_2_0 = CapacitiveSensor(2,0);        // 10 megohm resistor between pins 4 & 2, pin 2 is sensor pin, add wire, foil
CapacitiveSensor   cs_2_1 = CapacitiveSensor(2,1);        // 10 megohm resistor between pins 4 & 6, pin 6 is sensor pin, add wire, foil
CapacitiveSensor   cs_2_2 = CapacitiveSensor(2,2);        // 10 megohm resistor between pins 4 & 8, pin 8 is sensor pin, add wire, foil

void setup()                    
{

   cs_2_2.set_CS_AutocaL_Millis(0xFFFFFFFF);     // turn off autocalibrate on channel 1 - just as an example
   Serial.begin(9600);

}

void loop()                    
{
    long start = millis();
    long total1 =  cs_2_0.capacitiveSensor(30);
    long total2 =  cs_2_1.capacitiveSensor(30);
    long total3 =  cs_2_2.capacitiveSensor(30);

    Serial.print(millis() - start);        // check on performance in milliseconds
    Serial.print("\t");                    // tab character for debug window spacing

    Serial.print(total1);                  // print sensor output 1
    Serial.print("\t");
    Serial.print(total2);                  // print sensor output 2
    Serial.print("\t");
    Serial.println(total3);                // print sensor output 3

    delay(10);                             // arbitrary delay to limit data to serial port 
}