Here is your code with JS validation :D
<html>
<head>
<title>Contact Form</title>
</head>
<body>
<script type="text/javascript">
function validateForm()
{
var f = document.myform;
if(f.Name.value == "")
{
alert("Please enter your name");
f.Name.focus();
return false;
}
else if(!checkEmail(f.Email.value))
{
alert("Please enter your email address");
f.Email.focus();
return false;
}
else if(f.Feedback.value == "")
{
alert("Please enter some message");
f.Feedback.focus();
return false;
}
}
function checkEmail(str)
{
// Function from SmartWebby.com, modified by designcode
if(str == "")
return;
var at="@"
var dot="."
var lat=str.indexOf(at)
var lstr=str.length
var ldot=str.indexOf(dot)
if (str.indexOf(at)==-1)
return false;
if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr)
return false;
if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr)
return false;
if (str.indexOf(at,(lat+1))!=-1)
return false;
if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot)
return false;
if (str.indexOf(dot,(lat+2))==-1)
return false;
if (str.indexOf(" ")!=-1)
return false;
return true;
}
</script>
<form action="http://www.yoursitename.com/cgi-sys/formmail.pl" onsubmit="return validateForm();" name="myform" >
<input type="hidden" name="recipient" value="email">
<input type="hidden" name="subject" value="FormMail E-Mail">
<table cellspacing="2" cellpadding="2" border="0">
<tr>
<td align="left">Name:
<input type="text" name="Name" size="50"></td>
</tr>
<tr>
<td align="left">EMail:
<input type="text" name="Email" size="50"></td>
</tr>
<tr>
<td align="left">Feedback</td></tr>
<tr>
<td><textarea cols="50" rows="10" name="Feedback"></textarea></td>
</tr>
<tr>
<td align="left">
<input type="submit" value="Submit"><input type="reset" value="Reset">
<input type="hidden" name="redirect" value="thankyou.html"></td>
</tr>
</table>
</form>