diff --git a/addon/calc/calc.php b/addon/calc/calc.php
new file mode 100644
index 00000000..fd6a1177
--- /dev/null
+++ b/addon/calc/calc.php
@@ -0,0 +1,356 @@
+<?php
+
+function calc_install() {
+	register_hook('app_menu', 'addon/calc/calc.php', 'calc_app_menu');
+}
+
+function calc_uninstall() {
+	unregister_hook('app_menu', 'addon/calc/calc.php', 'calc_app_menu');
+
+}
+
+function calc_app_menu($a,&$b) {
+	$b['app_menu'] .= '<a href="calc">Calculator</a><br />'; 
+}
+
+
+function calc_module() {}
+
+
+
+
+function calc_init($a) {
+
+$x = <<< EOT
+
+<script language="JavaScript">
+/**************************************
+ * www.FemaleNerd.com         *
+ **************************************/
+
+// Declare global variables
+var displayText = ""
+var num1
+var num2
+var operatorType
+
+// Write to display
+function addDisplay(n){
+   id = document.getElementById("display");
+id.value = ""
+displayText += n
+id.value = displayText
+}
+
+// Addition
+function addNumbers() {
+if (displayText == "") {
+  displayText = result
+ }
+num1 = parseFloat(displayText)
+operatorType = "add"
+displayText = ""
+}
+
+// Subtraction
+function subtractNumbers() {
+if (displayText == "") {
+  displayText = result
+ }
+num1 = parseFloat(displayText)
+operatorType = "subtract"
+displayText = ""
+}
+
+// Multiplication
+function multiplyNumbers() {
+if (displayText == "") {
+  displayText = result
+ }
+num1 = parseFloat(displayText)
+operatorType = "multiply"
+displayText = ""
+}
+
+// Division
+function divideNumbers() {
+if (displayText == "") {
+  displayText = result
+ }
+num1 = parseFloat(displayText)
+operatorType = "divide"
+displayText = ""
+}
+
+// Sine
+function sin() {
+   id = document.getElementById("display");
+if (displayText == "") {
+  num1 = result
+  }
+else {
+  num1 = parseFloat(displayText)
+  }
+if (num1 != "") {
+  result = Math.sin(num1)
+  id.value = result
+  displayText = ""
+  }
+else {
+  alert("Please write the number first")
+  }
+}
+
+// Cosine
+function cos() {
+   id = document.getElementById("display");
+if (displayText == "") {
+  num1 = result
+  }
+else {
+  num1 = parseFloat(displayText)
+  }
+if (num1 != "") {
+  result = Math.cos(num1)
+  id.value = result
+  displayText = ""
+  }
+else {
+  alert("Please write the number first")
+  }
+}
+
+// ArcSine
+function arcSin() {
+   id = document.getElementById("display");
+if (displayText == "") {
+  num1 = result
+  }
+else {
+  num1 = parseFloat(displayText)
+  }
+if (num1 != "") {
+  result = Math.asin(num1)
+  id.value = result
+  displayText = ""
+  }
+else {
+  alert("Please write the number first")
+  }
+}
+
+// ArcCosine
+function arcCos() {
+   id = document.getElementById("display");
+if (displayText == "") {
+  num1 = result
+  }
+else {
+  num1 = parseFloat(displayText)
+  }
+if (num1 != "") {
+  result = Math.acos(num1)
+  id.value = result
+  displayText = ""
+  }
+else {
+  alert("Please write the number first")
+  }
+}
+
+// Square root
+function sqrt() {
+   id = document.getElementById("display");
+if (displayText == "") {
+  num1 = result
+  }
+else {
+  num1 = parseFloat(displayText)
+  }
+if (num1 != "") {
+  result = Math.sqrt(num1)
+  id.value = result
+  displayText = ""
+  }
+else {
+  alert("Please write the number first")
+  }
+}
+
+// Square number (number to the power of two)
+function square() {
+   id = document.getElementById("display");
+if (displayText == "") {
+  num1 = result
+  }
+else {
+  num1 = parseFloat(displayText)
+  }
+if (num1 != "") {
+  result = num1 * num1
+  id.value = result
+  displayText = ""
+  }
+else {
+  alert("Please write the number first")
+  }
+}
+
+// Convert degrees to radians
+function degToRad() {
+   id = document.getElementById("display");
+if (displayText == "") {
+  num1 = result
+  }
+else {
+  num1 = parseFloat(displayText)
+  }
+if (num1 != "") {
+  result = num1 * Math.PI / 180
+  id.value = result
+  displayText = ""
+  }
+else {
+  alert("Please write the number first")
+  }
+}
+
+// Convert radians to degrees
+function radToDeg() {
+   id = document.getElementById("display");
+if (displayText == "") {
+  num1 = result
+  }
+else {
+  num1 = parseFloat(displayText)
+  }
+if (num1 != "") {
+  result = num1 * 180 / Math.PI
+  id.value = result
+  displayText = ""
+  }
+else {
+  alert("Please write the number first")
+  }
+}
+
+// Calculations
+function calculate() {
+   id = document.getElementById("display");
+
+if (displayText != "") {
+  num2 = parseFloat(displayText)
+// Calc: Addition
+  if (operatorType == "add") {
+    result = num1 + num2
+    id.value = result
+    }
+// Calc: Subtraction
+  if (operatorType == "subtract") {
+    result = num1 - num2
+    id.value = result
+    }
+// Calc: Multiplication
+  if (operatorType == "multiply") {
+    result = num1 * num2
+    id.value = result
+    }
+// Calc: Division
+  if (operatorType == "divide") {
+    result = num1 / num2
+    id.value = result
+    }
+  displayText = ""
+  }
+  else {
+  id.value = "Oops! Error!"
+  }
+}
+
+// Clear the display
+function clearDisplay() {
+   id = document.getElementById("display");
+
+displayText = ""
+id.value = ""
+}
+</script>
+
+EOT;
+$a->page['htmlhead'] .= $x;
+}
+
+function calc_content($app) {
+
+$o = '';
+
+$o .=  <<< EOT
+
+<h3>Calculator</h3>
+<br /><br />
+<table>
+<tbody><tr><td> 
+<table bgcolor="#af9999" border="1">
+<tbody><tr><td>
+<table border="1" cellpadding="2" cellspacing="2">
+<form name="calc">
+<!--
+<TR><TD VALIGN=top colspan=6 ALIGN="center"> <H2>Calculator</H2> </TD>
+-->
+<tbody><tr>
+	<td colspan="5"><input size="22" id="display" name="display" type="text"></td>
+</tr><tr align="left" valign="middle">
+	<td><input name="one" value="&nbsp;&nbsp;1&nbsp;&nbsp;&nbsp;" onclick="addDisplay(1)" type="button"></td>
+	<td><input name="two" value="&nbsp;&nbsp;2&nbsp;&nbsp;&nbsp;" onclick="addDisplay(2)" type="button"></td>
+	<td><input name="three" value="&nbsp;&nbsp;3&nbsp;&nbsp;&nbsp;" onclick="addDisplay(3)" type="button"></td>
+	<td><input name="plus" value="&nbsp;&nbsp;+&nbsp;&nbsp;&nbsp;" onclick="addNumbers()" type="button"></td>
+</tr><tr align="left" valign="middle">
+	<td><input name="four" value="&nbsp;&nbsp;4&nbsp;&nbsp;&nbsp;" onclick="addDisplay(4)" type="button"></td>
+	<td><input name="five" value="&nbsp;&nbsp;5&nbsp;&nbsp;&nbsp;" onclick="addDisplay(5)" type="button"></td>
+	<td><input name="six" value="&nbsp;&nbsp;6&nbsp;&nbsp;&nbsp;" onclick="addDisplay(6)" type="button"></td>
+	<td><input name="minus" value="&nbsp;&nbsp;&nbsp;-&nbsp;&nbsp;&nbsp;" onclick="subtractNumbers()" type="button"></td>
+</tr><tr align="left" valign="middle">
+	<td><input name="seven" value="&nbsp;&nbsp;7&nbsp;&nbsp;&nbsp;" onclick="addDisplay(7)" type="button"></td>
+	<td><input name="eight" value="&nbsp;&nbsp;8&nbsp;&nbsp;&nbsp;" onclick="addDisplay(8)" type="button"></td>
+	<td><input name="nine" value="&nbsp;&nbsp;9&nbsp;&nbsp;&nbsp;" onclick="addDisplay(9)" type="button"></td>
+	<td><input name="multiplication" value="&nbsp;&nbsp;*&nbsp;&nbsp;&nbsp;&nbsp;" onclick="multiplyNumbers()" type="button"></td>
+</tr><tr align="left" valign="middle">
+	<td><input name="zero" value="&nbsp;&nbsp;0&nbsp;&nbsp;&nbsp;" onclick="addDisplay(0)" type="button"></td>
+	<td><input name="pi" value="&nbsp;Pi&nbsp;&nbsp;" onclick="addDisplay(Math.PI)" type="button"> </td> 
+	<td><input name="dot" value="&nbsp;&nbsp;&nbsp;.&nbsp;&nbsp;&nbsp;" onclick='addDisplay(".")' type="button"></td>
+	<td><input name="division" value="&nbsp;&nbsp;&nbsp;/&nbsp;&nbsp;&nbsp;" onclick="divideNumbers()" type="button"></td>
+</tr><tr align="left" valign="middle">
+	<td><input name="sqareroot" value="sqrt" onclick="sqrt()" type="button"></td>
+	<td><input name="squarex" value=" x^2" onclick="square()" type="button"></td>
+	<td><input name="deg-rad" value="d2r&nbsp;" onclick="degToRad()" type="button"></td>
+	<td><input name="rad-deg" value="r2d&nbsp;" onclick="radToDeg()" type="button"></td>
+</tr><tr align="left" valign="middle">
+	<td><input name="sine" value="&nbsp;sin&nbsp;" onclick="sin()" type="button"></td>
+	<td><input name="arcsine" value="asin" onclick="arcSin()" type="button"></td>
+	<td><input name="cosine" value="cos" onclick="cos()" type="button"></td>
+	<td><input name="arccosine" value="acs" onclick="arcCos()" type="button"></td>
+
+</tr><tr align="left" valign="middle">
+	<td colspan="2"><input name="clear" value="&nbsp;&nbsp;Clear&nbsp;&nbsp;" onclick="clearDisplay()" type="button"></td>
+	<td colspan="3"><input name="enter" value="&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;" onclick="calculate()" type="button"></td>
+
+</tr></tbody></table>
+</form>
+
+	<!--
+	<TD VALIGN=top> 
+		<B>NOTE:</B> All sine and cosine calculations are
+		<br>done in radians. Remember to convert first
+		<br>if using degrees.
+	</TD>
+	-->
+	
+</td></tr></tbody></table>
+
+
+</td></tr></tbody></table>
+
+EOT;
+return $o;
+
+}