I thought you weren't go to use negative values for variables anymore? You could just store it as a positive variable (YEAR -3000, would be YEAR 0), and then just subtract 3000 when you show it to the player.
If you want more control over you're scripting, you need to use page scripting, like the script I showed you when you first ask the question. There, you can use the AND function, and change the script to:
IF %YEAR = -3000 AND %SECRET = 1 THEN
$PAGETEXT := $PAGETEXT + "<img alt="1-1.jpg" src="http://chooseyourstory.com/resources/images/user/19807" />"
ELSE IF %YEAR = -3000 AND %SECRET = 2 THEN
$PAGETEXT := $PAGETEXT + "<img alt="1-2.jpg" src="http://chooseyourstory.com/resources/images/user/19808" />"