Hi, I am a beginner to Javascript and I am at a loss with this code. In fact I am about to start pulling my hair out because I just can't figure it out. I need to code a web page using JavaScript to do the following:

assign 2 classes to Steve Perry for the Fall 2002 semester.
Each time you make a selection from the dropdown lists (or change text
in anyway) change the message display in the window.

Make sure you don't display any value that is a hyphen or where nothing is entered
(You DON'T have to handle the condition where someone enters spaces in a text field)

Use the format shown below:

Note: Use \n to put newlines in your strings
Use \t to put a tab in your strings

When the user clicks the Submit Message button, display a message box with the following message:

If "Instructor (send mail)" is selected: I am sending this message to the Instructor
If "Save Email Text" is selected: I am saving this message

I have the HTML code, but just can't get the correct Javascript:

Code:
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
<html><head><title>Maintain Schedule</title></head><body aink="FFFFFF" bgcolor="#c0c0c0" link="#0000ff" text="teal" vlink="#0000ff">
<h3>Class Schedule for Perry,Steve

<form name="myForm">

<table bgcolor="#c0c0c0" border="0" cellpadding="1" cellspacing="0" cols="5" width="70%">

<tbody><tr>
<td><font face="Arial"><font size="-1"><b>Course</b></font><b></b></font></td>
<td><font face="Arial"><font size="-1"><b>Semester</b></font><b></b></font></td>
<td><font face="Arial"><font size="-1"><b>Day/Time (e.g FRI 8-11:50am)</b></font><b></b></font></td>
<td><font face="Arial"><font size="-1"><b>Room</b></font><b></b></font></td>
</tr>

<tr>
<td><font face="Arial"><font size="-1">
</font></font></td>
</tr>

<tr>
<td><font face="Arial">
<font size="-1">
<select name="course6" size="1">
<option value="-">-
</option><option value="138">138
</option><option value="190">190
</option><option value="192">192
</option><option value="193">193
</option><option value="194">194
</option><option value="195">195
</option><option value="196">196
</option><option value="197">197
</option></select>
</font></font>
</td>

<td><font face="Arial"><font size="-1">
<select name="semester6" size="1">
<option value="-">-
</option><option value="Fall2001">Fall2001
</option><option value="Spring2002">Spring2002
</option><option value="Summer2002">Summer2002
</option><option value="Fall2002">Fall2002
</option></select>
</font></font></td>

<td><font face="Arial"><font size="-1">
<input value="" maxlength="30" name="daytime6" size="30" align="left" type="text">
</font></font></td>

<td><font face="Arial"><font size="-1">
<select name="room6" size="1">
<option value="-">-
</option><option value="B-7">B-7
</option><option value="B-9">B-9
</option><option value="B-12">B-12
</option><option value="EC-103">EC-103
</option><option value="EC-104">EC-104
</option><option value="EC-706">EC-706
</option><option value="Online">Online
</option></select>
</font></font></td>
</tr>

<tr>
<td><font face="Arial"><font size="-1">
<select name="course7" size="1">
<option value="-">-
</option><option value="138">138
</option><option value="190">190
</option><option value="192">192
</option><option value="193">193
</option><option value="194">194
</option><option value="195">195
</option><option value="196">196
</option><option value="197">197
</option></select>
</font></font></td>

<td><font face="Arial"><font size="-1">
<select name="semester7" size="1">
<option value="-">-
</option><option value="Fall2001">Fall2001
</option><option value="Spring2002">Spring2002
</option><option value="Summer2002">Summer2002
</option><option value="Fall2002">Fall2002
</option></select>
</font></font></td>

<td><font face="Arial"><font size="-1">
<input value="" maxlength="30" name="daytime7" size="30" align="left" type="text">
</font></font></td>

<td><font face="Arial"><font size="-1">
<select name="room7" size="1">
<option value="-">-
</option><option value="B-7">B-7
</option><option value="B-9">B-9
</option><option value="B-12">B-12
</option><option value="EC-103">EC-103
</option><option value="EC-104">EC-104
</option><option value="EC-706">EC-706
</option><option value="Online">Online
</option></select>
</font></font></td>
</tr>

</tbody></table>

<font face="Arial"><font size="-1">
<br>Send Message to: <font size="-1">

<input name="sendto" value="I" checked="checked" type="radio">Instructor (send email): 
<input name="sendto" value="T" type="radio">Save Email Text</font><br>

<textarea name="comments" rows="8" cols="80" wrap="physical"></textarea>

<br><br><input name="Submit Message" value="Submit Message" type="button">

<input name="deptchair" value="Pistone,Walter" type="hidden">
<input name="instructor_selected" value="Perry,Steve" type="hidden">


</font></font></form></h3></body></html>
please, please help if you can. I have been trying different things for almost 2 weeks now, and have searched and read so many books and websites and am just getting more confused.