diff --git a/params.go b/params.go
index 0fcc1f0..a72aaed 100644
--- a/params.go
+++ b/params.go
@@ -244,3 +244,25 @@
 	// Return an error if the underlying type of 'opts' isn't a struct.
 	return optsMap, fmt.Errorf("Options type is not a struct.")
 }
+
+// IDSliceToQueryString takes a slice of elements and converts them into a query
+// string. For example, if name=foo and slice=[]int{20, 40, 60}, then the
+// result would be `?name=20&name=40&name=60'
+func IDSliceToQueryString(name string, ids []int) string {
+	str := ""
+	for k, v := range ids {
+		if k == 0 {
+			str += "?"
+		} else {
+			str += "&"
+		}
+		str += fmt.Sprintf("%s=%s", name, strconv.Itoa(v))
+	}
+	return str
+}
+
+// IntWithinRange returns TRUE if an integer falls within a defined range, and
+// FALSE if not.
+func IntWithinRange(val, min, max int) bool {
+	return val > min && val < max
+}