diff --git a/includes/convert.php b/includes/convert.php
new file mode 100644
index 0000000..07347f5
--- /dev/null
+++ b/includes/convert.php
@@ -0,0 +1,110 @@
+<?php
+/**
+ * Created by Stefan Herndler.
+ * User: Stefan
+ * Date: 17.05.14
+ * Time: 00:16
+ * Version: 1.0
+ * Since: 1.0-gamma
+ */
+
+
+/**
+ * converts a integer into the user-defined counter style for the footnotes
+ * @since 1.0-gamma
+ * @param int $p_int_Index
+ * @param string $p_str_ConvertStyle [counter style]
+ * @return string
+ */
+function footnote_convert_index($p_int_Index, $p_str_ConvertStyle="arabic_plain")
+{
+	switch($p_str_ConvertStyle) {
+		case "romanic":
+			return footnote_convert_to_romanic($p_int_Index);
+		case "latin_high":
+			return footnote_convert_to_latin($p_int_Index, true);
+		case "latin_low":
+			return footnote_convert_to_latin($p_int_Index, false);
+		case "arabic_leading":
+			return footnote_convert_to_arabic_leading($p_int_Index);
+		case "arabic_plain":
+		default:
+			return $p_int_Index;
+	}
+}
+
+/**
+ * converts a integer into latin ascii characters, either lower or upper-case
+ * function available from A to ZZ ( means 676 footnotes at 1 page possible)
+ * @since 1.0-gamma
+ * @param int $p_int_Value
+ * @param bool $p_bool_UpperCase
+ * @return string
+ */
+function footnote_convert_to_latin($p_int_Value, $p_bool_UpperCase)
+{
+	/* decimal value of the starting ascii character */
+	$l_int_StartinAscii = 65-1; // = A
+	/* if lower-case, change decimal to lower-case "a" */
+	if (!$p_bool_UpperCase) {
+		$l_int_StartinAscii = 97-1; // = a
+	}
+	/* output string */
+	$l_str_Return = "";
+	$l_int_Offset = 0;
+	/* check if the value is higher then 26 = Z */
+	while($p_int_Value > 26) {
+		/* increase offset and reduce counter */
+		$l_int_Offset++;
+		$p_int_Value -= 26;
+	}
+	/* if offset set (more then Z), then add a new letter in fron */
+	if ($l_int_Offset > 0) {
+		$l_str_Return = chr($l_int_Offset + $l_int_StartinAscii);
+	}
+	/* add the origin letter */
+	$l_str_Return .= chr($p_int_Value + $l_int_StartinAscii);
+	/* return the latin character representing the integer */
+	return $l_str_Return;
+}
+
+/**
+ * converts a integer to a leading-0 integer
+ * @since 1.0-gamma
+ * @param int $p_int_Value
+ * @return string
+ */
+function footnote_convert_to_arabic_leading($p_int_Value)
+{
+	/* add a leading 0 if number lower then 10 */
+	if ($p_int_Value < 10) {
+		return "0" . $p_int_Value;
+	}
+	return $p_int_Value;
+}
+
+/**
+ * converts a arabic integer value into a romanic letter value
+ * @since 1.0-gamma
+ * @param int $p_int_Value
+ * @return string
+ */
+function footnote_convert_to_romanic($p_int_Value)
+{
+	/* table containing all necessary romanic letters */
+	$l_arr_RomanicLetters = array('M'=>1000, 'CM'=>900, 'D'=>500, 'CD'=>400, 'C'=>100, 'XC'=>90, 'L'=>50, 'XL'=>40, 'X'=>10, 'IX'=>9, 'V'=>5, 'IV'=>4, 'I'=>1);
+	/* return value */
+	$l_str_Return = '';
+	/* loop through integer value until it is reduced to 0 */
+	while($p_int_Value > 0) {
+		foreach($l_arr_RomanicLetters as $l_str_Romanic => $l_int_Arabic) {
+			if($p_int_Value >= $l_int_Arabic) {
+				$p_int_Value -= $l_int_Arabic;
+				$l_str_Return .= $l_str_Romanic;
+				break;
+			}
+		}
+	}
+	/* return romanic letters as string */
+	return $l_str_Return;
+}
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