Form requires multiple clicks to execute?

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      <table style="text-align: left; width: 546px; height: 71px;"
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 style="background-image: url(http://prosperityclicks.com/wp-content/uploads/2012/06/socialbg.png); width: 410px; vertical-align: middle;">
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                  <td style="width: 69px;"></td>
                  <td style="width: 110px; vertical-align: middle;"
 allowtransparency="true" frameborder="0" scrolling="no"><iframe
 src="//www.facebook.com/plugins/like.php?href=%cur_url%&send=false&layout=button_count&width=100&show_faces=false&action=like&colorscheme=light&font&height=21&appId=155303851207793"
 style="border: medium none ; overflow: hidden; width: 100px; height: 21px;"
 allowtransparency="true" frameborder="0" scrolling="no"></iframe>
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                  <td style="width: 110px;"><a href="https://twitter.com/share" class="twitter-share-button" data-via="RobertMGouge">Tweet</a>
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                  <td style="width: 110px;"><g:plusone
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                  <td style="vertical-align: top; height: 125px;"><big><span
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                  <form method="post"
 action="https://app.icontact.com/icp/signup.php"
 name="icpsignup" id="icpsignup12933"
 accept-charset="UTF-8" onsubmit="return verifyRequired12933();"><input
 name="redirect"
 value="http://www.prosperityclicks.com/subscribe-success/"
 type="hidden">
                    <input name="errorredirect"
 value="http://www.prosperityclicks.com/subscribe-error/"
 type="hidden"><input name="listid" value="107788"
 type="hidden"><input name="specialid:107788"
 value="XG6W" type="hidden"><input name="clientid"
 value="951176" type="hidden"><input name="formid"
 value="12933" type="hidden"><input
 name="reallistid" value="1" type="hidden"><input
 name="doubleopt" value="1" type="hidden">
                    <div id="SignUp">
                    <table style="width: 453px; height: 60px;"
 border="0" cellpadding="0" cellspacing="0">
                      <tbody>
                        <tr>
                          <td style="width: 234px;"><input
 size="30" name="fields_fname" value="First Name" /></td>
                          <td style="width: 219px;"
 rowspan="2"><button><img src="http://prosperityclicks.com/wp-content/uploads/2012/07/instantaccess.png"></button>
 </td>
                        </tr>
                        <tr>
                          <td style="width: 234px;"><input
 size="30" name="fields_email" value="Email" /></td>
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                    </div>
                  </form>
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var icpForm12933 = document.getElementById('icpsignup12933');
if (document.location.protocol === "https:")
icpForm12933.action = "https://app.icontact.com/icp/signup.php";
function verifyRequired12933() {
if (icpForm12933["fields_email"].value == "") {
icpForm12933["fields_email"].focus();
alert("The Email field is required.");
return false;
}
if (icpForm12933["fields_fname"].value == "") {
icpForm12933["fields_fname"].focus();
alert("The First Name field is required.");
return false;
}
return true;
}
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            <td style="width: 20px;"></td>
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