Woot, I figured it out by myself :D (and with some help from the codex).
get_bloginfo()
I used get_bloginfo($show) to get the name of the current blog then I made the if statement comparing it to $currentblogname which is set to "Mac Gaming News and Reviews". So, if the output of get_bloginfo($show) is the same as the value of $currentblogname (Mac Gaming News and Reviews), I know I'm on that current page so I put the non-link with the id so I can make that different in the CSS, so people can tell what blog they are on. If I'm currently not on that page, the if statement goes to the else option which is just the normal link.
<li>
<?php
$currentblogname = "Mac Gaming News and Reviews";
if (get_bloginfo($show) == $currentblogname) {
echo '<span id="active-nav-link">Mac</span>';
} else {
echo '<a href="http://mac.gamingapple.com">Mac</a>';
}
?>
</li>
<li>
<?php
$currentblogname = "iPad Gaming News and Reviews";
if (get_bloginfo($show) == $currentblogname) {
echo '<span id="active-nav-link">iPad</span>';
} else {
echo '<a href="http://ipad.gamingapple.com">iPad</a>';
}
?>
</li>
<li>
<?php
$currentblogname = "iPhone Gaming News and Reviews";
if (get_bloginfo($show) == $currentblogname) {
echo '<span id="active-nav-link">iPhone</span>';
} else {
echo '<a href="http://iphone.gamingapple.com">iPhone</a>';
}
?>
</li>
Hopefully this will help someone if they are looking for the same thing. I'm kinda new to PHP so this could easily be a bad way of accomplishing this.