ok, I am working on an assignment (yes, school work) we are just being introduced to javascript. I have a contact page that I am trying to create an alert if the user tries to submit form without entering an email address. but it is not working. I have been staring at this for over an hour and can not find the problem. I am an online student and my teacher has not responded to my emails and this is due tonight. Can someone take a look and let me know if you can see my problem?
Code:
<!DOCTYPE html>
<html lang="en">
<head>

<title>Contact</title>
<meta charset="utf-8">
<link rel="stylesheet" href="fishcreek.css">
<script type="text/javascript">
<!--
function validateForm() {
if (document.forms[0].myEmail.value = = " " ) {
	alert("Please enter an email address.");
	return false;
} //end if
return true;
} // end function validateForm
// -->
</script>

</head>
<body>
<div id="wrapper">
<h1 id="header"><img src="fishcreeklogo.gif" height="77" width="600" alt="Fish Creek Animal Hospital"></h1>
<div class="nav" id="leftcolumn">
	<ul>
	<li><a href="index.html">Home</a></li>
	<li><a href="services.html">Services</a><li> 
	<li><a href="askvet.html">Ask the Vet</a><li>  
	<li><a href="contact.html">Contact</a><li>
	</ul></div>
<br>
<div id="rightcolumn">
	<h2>Contact Fish Creek</h2>
<form method="post" action="http://webdevbasics.net/scripts/fishcreek.php"
		onsubmit="return validateForm();">
	<label for="myName">Name: </label><input type="text" name="myName" id="myName">
	<label for="myEmail">E-mail:</label> <input type="text" name="myEmail" id="myEmail">
	<label for="myComments">Comments: </label>
	<textarea name="myComments" id="MyComments" rows="2" cols="20"></textarea>
	<input id="mySubmit" type="submit" value="Send Now">
<br></form>
<div ID= "footer"><div class="nav">
	<a href="index.html">Home</a>
	<a href="services.html">Services</a>
	<a href="askvet.html">Ask the Vet</a> 
	<a href="contact.html">Contact</a><br>
	Copyright &copy; 2013 Fish Creek Animal Hospital</div>
<a href="mailto:magda@patel.com">Magda@Patel.com</a></div></div></div>
</body>
</html>