diff --git a/system/functions.php b/system/functions.php
index 2437094f..2a37536f 100644
--- a/system/functions.php
+++ b/system/functions.php
@@ -1408,6 +1408,16 @@ function getCreatureImgPath($creature){
 	}
 }
 
+function between($x, $lim1, $lim2) {
+	if ($lim1 < $lim2) {
+		$lower = $lim1; $upper = $lim2;
+	}
+	else {
+		$lower = $lim2; $upper = $lim1;
+	}
+	return (($x >= $lower) && ($x <= $upper));
+}
+
 // validator functions
 require_once LIBS . 'validator.php';
 require_once SYSTEM . 'compat.php';