I need help with a Signal Sending Circut

I have the BASIC stamp homework board by parallax. I also have their PIR sensor. I want to make the circut so it will send a signal to my phone without another phone, but rather the computer. The only problem is, I don't know how to make something like that. So, does anyone know what i could do? This is the code I am using right now:


' =========================================================================
'
' File...... PIR_Advanced_Demo.bs2
' Purpose... Demonstrate PIR Sensor With Warm-Up Code
' Author.... Parallax, Inc.
' E-mail.... support@parallax.com
' Started... 12-14-2005
'
' {$STAMP BS2}
' {$PBASIC 2.5}
'
' =========================================================================


' -----[ Program Description ]---------------------------------------------

' This PIR demo allows you to see how to go about allowing a warm-up time
' for the sensor to settle, as well as displayed number of times tripped
' and possibly activating an alarm or relay, in this case the LED. The LED
' should have a 220 ohm or 330 ohm resistor in series with it.


' -----[ I/O Definitions ]-------------------------------------------------

PIR PIN 0 ' I/O Pin For PIR Sensor
LED PIN 1 ' I/O Pin For LED


' -----[ Variables ]-------------------------------------------------------

counter VAR Byte ' Trip Counter


' -----[ Initialization ]--------------------------------------------------

DEBUG CLS ' Clear DEBUG Screen
FOR counter = 40 TO 0 ' Wait 40 Seconds For PIR Warm-Up
DEBUG HOME, "WARMING UP:", DEC2 counter
PAUSE 1000 ' Display Counter Every Second
NEXT

counter = 0 ' Clear Counter Variable

DEBUG HOME, "WAITING... " ' Display Waiting Message

' -----[ Program Code ]----------------------------------------------------

Main:
DO
IF PIR = 1 THEN ' Motion Detected?
counter = counter + 1 ' Update Trip Counter
HIGH LED ' Light LED
DEBUG HOME, "TRIPPED...", DEC3 counter
DO : LOOP UNTIL PIR = 0 ' Wait For PIR To Clear
DEBUG HOME, "CLEARED...", DEC3 counter
LOW LED ' Turn Off LED
ENDIF
LOOP





PLEASE HELP!

I don't use this micros but I need some details.Do you need to ring the phone (Land phone) after PIR detects a signal?

Actually, I want a signal sent to my Cell phone. Just a simple text saying something like Intruder. I wasn't going to use a land line because I want to know if anybody goes into my room while im not home.

How do you plan on connecting the Stamp to your cell phone?

Well, I dont want to connect it to the cell phone. Rather, I want to send some kind of signal to the computer to send me a text to my phone. Yes, I know it's complicated, but I don't have the money to buy another cell phone. Anyways, yeah. I want a signal sent to my computer to get it to send me a text. Bottom line. I know Yahoo lets you send texts, but I don't know how I would go about it. Am I going to need a special program for it, or could I make something?