I am attempting to write a javascript function that calculates the cost of a trip for three different vehicles based on HTML form input (Please see HTML code below). Can you please take a look at my javascript function attempt (below) and provide any suggestions that you might have? Thank you.

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
    <link rel="stylesheet" type="text/css" href="doc.css" />
    <!-- Alternate Netscape 4 shielding version of including css file
      <style type="text/css">@import "C:\Users\ME\Desktop\doc.css";</style>
    <script type="text/javascript" src="C:\Users\ME\Desktop\jsdoc.js">
    <title>Calculating with JavaScript and HTML Forms</title>
      <h2>This page requires JavaScript</h2>
    <img src="C:\Users\ME\Desktop\logoSML.bmp" alt="logo" width="400" />
    <p> In this lab lets look at some additional things that JavaScript
    can do, such as make calculations with user input from a form. </p>
    <h2>The Problem: </h2>
    <p>I want to take a drive from Colorado Springs to
    Yellowstone Park. The reported distance is 638 miles. I would like to know
    how much the fuel is going to cost me to make this round trip. I have three options
    for my transportation....Assume that gas costs on averate $2.33 per gallon.</p>
    	<li>My Car that gets on average 19mpg...</li>
    	<li>My Motorcycle that gets on average 76 mpg...</li>
    	<li>My Friends hybrid that gets on average 48mpg</li>
    <br />	
  <p>  Fill in the form items below to get the input necessary to make the calculations: </p>
   <p> <label>Distance to be traveled: <input type="text" size = "8" name="distance"
    id="dist" /></label></p>
   <p> <label>MPG for My Car: <input type="text" size = "8" name="mycarMpg"
    id="mycarMPG" /></label></p>
   <p> <label>MPG for Motorcycle: <input type="text" size = "8" name="mtrcycMpg"
    id="mcmpg" /></label></p>
   <p> <label>MPG for the Hybrid: <input type="text" size = "8" name="hybridMpg"
    id="hmpg" /></label></p>
      <input type="button" value="Calculate the cost for each vehicle"
    <br /> <br />
    <table align="center" border="3">
    	<th>Cost with My Car</th>
    	<th>Cost with Motorcycle</th>
    	<th>Cost with Hybrid</th>
    	<td id="mycar">&nbsp</td>
    	<td id="mtrcyc">&nbsp</td>
    	<td id="hybrid">&nbsp</td>
function CalculateCost(){
var dist = document.getElementById("dist").value;
var mycarMpg = document.getElementById("mycarMpg").value;
var mtrcycMPG = document.getElementById("mtrcycMpg").value;
var hybridMpg = document.getElementById("hybridMpg").value;

var mycar = document.getElementById("mycar").value;
var mtrcyc = document.getElementById("mtrcyc").value;
var hybrid = document.getElementById("hybrid").value;

mycar = dist/mycarMpg*2.33;
mycar = Math.round(mycar * 100)/100;

mtrcyc = dist/mtrcycMPG*2.33;
mtrcyc = Math.round(mtrcyc * 100)/100;

hybrid = dist/hybridMpg*2.33;
hybrid = Math.round(hybrid * 100)/100;