External form won't work

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I am using an external form so I can send form results directly to the client's email.

It comes in fine as a content block but the submit button doesn't work. Is this a javascript clash? Can someone solve it for me ?

<form action="<? echo $PHP_SELF ?>" method="post" name="sendform" onsubmit="javascript:checkform()"><span style="color: red;">*</span> = You must fill this field .</form><form action="<? echo $PHP_SELF ?>" method="post" name="sendform" onsubmit="javascript:checkform()"></form><form action="<? echo $PHP_SELF ?>" method="post" name="sendform" onsubmit="javascript:checkform()"><center>
<table id="tbody" style="border-collapse: collapse; width: 100%;" border="1" cellpadding="4">
<tbody>
<tr>
<td width="30%">Name<span style="color: red;">*</span> :</td>
<td><input style="border: 1px solid #AAAAAA; padding: 0; background-color: #ffffff;" type="text" name="v1" /></td>
</tr>
<tr>
<td>E-mail<span style="color: red;">*</span> :</td>
<td><input style="border: 1px solid #AAAAAA; padding: 0; background-color: #ffffff;" type="text" name="v2" /></td>
</tr>
<tr>
<td>Telephone<span style="color: red;">*</span> :</td>
<td><input style="border: 1px solid #AAAAAA; padding: 0; background-color: #ffffff;" type="text" name="v3" /></td>
</tr>

trixiemay