IE7 text box scrolling overflow issue

<div id="divNewsletter" class="leftNav" style="z-index: 670;">
                    <span id="ctl00_NewsletterControl1">
<div id="ptkSubscribe" style="z-index: 660;">
        <div class="emailAddress" style="z-index: 650;">Email Address</div><table width="50px" style="width:50px" class="NewsletterBox">
        <tbody><tr>
            <td colspan="2"></td>
        </tr>
 
<input type="hidden" value="" id="txt_NL_FirstName">
<input type="hidden" value="" id="txt_NL_LastName">
 
        <tr>
 
        <td>
            <input type="text" size="13" onkeypress="enterSubmit(event);" id="txtEmailAddress"><br>
        <input type="hidden" value="" id="txtCaptcha"><br></td>
    </tr>
    <tr>
        <td align="left" colspan="2"><input type="button" onclick="clickSubmit();" id="cmdSubmit" value="Submit"></td>
    </tr>
    </tbody></table>
  </div>
 
 
            <script>
            function clickSubmit()
            {
                var xReq = new SOAPRequest('Newsletter.Subscribe.asmx', 'Subscribe', 'http://aspdotnetstorefront.com')  
                xReq.addParameter('emailAddress', document.getElementById('txtEmailAddress').value);
                xReq.addParameter('Captcha', document.getElementById('txtCaptcha').value);
                xReq.Execute(buildBox);
            }
            function buildBox(submitResponse)
            {
                document.getElementById('ptkSubscribe').innerHTML =
                    submitResponse;
            }
            </script>
 
<script>// ------------------------------------------------------------------------------------------
// Copyright AspDotNetStorefront.com, 1995-2011.  All Rights Reserved.
// <a href="http://www.aspdotnetstorefront.com" rel="nofollow">http://www.aspdotnetstorefront.com</a>
// For details on this license please visit  the product homepage at the URL above.
// THE ABOVE NOTICE MUST REMAIN INTACT.
// ------------------------------------------------------------------------------------------
///&lt;reference name="MicrosoftAjax.js"/&gt;
 
Type.registerNamespace("AspDotNetStorefrontControls");
 
AspDotNetStorefrontControls.NewsletterControl = function(element) {
    AspDotNetStorefrontControls.NewsletterControl.initializeBase(this, [element]);
}
 
AspDotNetStorefrontControls.NewsletterControl.prototype = {
    initialize: function() {
        AspDotNetStorefrontControls.NewsletterControl.callBaseMethod(this, 'initialize');
 
        // Add custom initialization here
    },
    dispose: function() {        
        //Add custom dispose actions here
        AspDotNetStorefrontControls.NewsletterControl.callBaseMethod(this, 'dispose');
    }
 
 
}
function enterSubmit(e)
{
    var key;
    if(window.event)
    {
    key = e.keyCode;
    }
else if(e.which)
    {
    key = e.which;
    }
    if (key == 13)
    {
        clickSubmit();
    }
}
function clickSubmit()
{
   var firstName = $get('txt_NL_FirstName').value;
   var lastName = $get('txt_NL_LastName').value;
   var address = $get('txtEmailAddress').value;
   var captcha = $get('txtCaptcha').value;
 
    AspDotNetStorefrontControls.NewsletterControlService.Subscribe(firstName, lastName, address, captcha, callback);
 
}
 
function callback(res)
{   
    if (res == "CAPTCHA_ERROR")
    {
        AspDotNetStorefrontControls.NewsletterControlService.getCapthaErrorBlock(callback);
        AspDotNetStorefrontControls.NewsletterControlService.ErrorStallback(callback);
    }
    else if (res == "ADDRESS_ERROR")
    {
        AspDotNetStorefrontControls.NewsletterControlService.getAddressErrorBlock(callback);
        AspDotNetStorefrontControls.NewsletterControlService.ErrorStallback(callback);
    }
    else
    {
        $get("ptkSubscribe").innerHTML = res;
    }
}
 
 
AspDotNetStorefrontControls.NewsletterControl.registerClass('AspDotNetStorefrontControls.NewsletterControl', Sys.UI.Control);
 
if (typeof(Sys) !== 'undefined') Sys.Application.notifyScriptLoaded();
</script></span>
                    <div id="signUpText" style="z-index: 640;">Sign up to our newsletter</div>
                </div>

/*hide the newsletter default email address*/
.emailAddress
{
    display:none;
}
 
#divNewsletter {
    background-image: url("http://i43.tinypic.com/xokqyr.jpg");
    background-repeat: no-repeat;
    height: 230px;
    position: relative;
    top: 20px;
    width: 230px;
}
 
 
#txtEmailAddress {
    background-color: transparent;
    background-image: url("http://i40.tinypic.com/t89g9d.png");
    border: 0 none;
    font-size: 12px;
    height: 30px;
    left: 16px;
    padding-left: 5px;
    position: absolute;
    top: 91px;
    width: 196px;
    background-repeat:no-repeat;
    border: 0;
 }
 
#ptkSubscribe {
     color: black;
}
 
#ptkSubscribe #cmdSubmit {
     background-color: transparent;
     background-image: url("http://i41.tinypic.com/4h7brk.jpg");
     border: medium none;
     color: transparent;
     cursor: pointer;
     font-size: 0pt;
     height: 29px;
     left: 59px;
     line-height: 0;
     position: absolute;
     text-transform: capitalize;
     top: 132px;
     width: 100px;
}
 
 
 
div#ptkSubscribe{
    width: 261px;
 
    color: #302721;
}
 
div#ptkSubscribe input {
    border: 0;
    padding: 3px;
    height: 22px;
    width: 160px;
    background-color: transparent;
    border: 0 none;
    font-size: 12px;
    height: 30px;
    left: 16px;
    padding-left: 5px;
    position: absolute;
    top: 91px;
    width: 196px;
    background-repeat:no-repeat;
    border: 0;
}
 
 
#signUpText {
    color: #8B8B8B;
    font-size: 13pt;
    left: 64px;
    position: absolute;
    text-align: center;
    top: 39px;
    width: 101px;
}