javascript error in ie

Hallo allemaal ik ben de laste tijd flink bezig geweest met javascript nu ging ik dit javascripje test op ie maar krijg ik een error bij javascript:reg_new_user('http://127.0.0.1/projecten/antronic/');
Waarom werkt dit niet in ie heeft iemand misschien een oplossing ?

<?php
function reg_new_user(srv)
{
var module_name = document.forms["reg_new"].module_name.value;
var submit_reg = document.forms["reg_new"].submit_reg.value;
var user_name = document.forms["reg_new"].user_name.value;
var pass1 = document.forms["reg_new"].pass1.value;
var pass2 = document.forms["reg_new"].pass2.value;
var email = document.forms["reg_new"].email.value;
var check_mail = document.forms["reg_new"].check_mail.value;
var countries = document.forms["reg_new"].countries.value;
var dob = document.forms["reg_new"].dob.value;
var sex = document.forms["reg_new"].sex.value;
var len = document.forms["reg_new"].sex.length;
for (i = 0; i <len; i++) {
if (document.forms["reg_new"].sex[i].checked) {
var chosen = document.forms["reg_new"].sex[i].value;
}
}

post_page(srv+'modules/mod_login_system/mod_login_system_reg_new_user.php?module_name='+module_name+'&submit_reg='+submit_reg+'&user_name='+user_name+'&pass1='+pass1+'&pass2='+pass2+'&email='+email+'&check_mail='+check_mail+'&countries='+countries+'&dob='+dob+'&sex='+chosen+'', function() { reg_new_user_update(); });
}


function reg_new_user_update()
{
if (xmlhttp.readyState==4)
{
var window1 = document.getElementById("register_check");
window1.style.display = 'block';
window1.innerHTML = xmlhttp.responseText;
}
}

?>


<form action="javascript:reg_new_user('http://127.0.0.1/projecten/antronic/');" method="post" name="reg_new" id="myForm" enctype="multipart/form-data">
<input type="hidden" name="module_name" value="mod_login_system" />
<table width="500" border="0" class="content_box_1_4">
<tr>
<td width="150"><label for="user_name">Username:</label></td>
<td><input type="text" name="user_name" />
</td>
</tr>
<tr>

<td width="150"><label for="pass1">Password:</label></td>
<td width="300"><input type="password" name="pass1" id="mypassword" onkeyup="runPassword(this.value, 'mypassword');" />
<div style="width: 100px; height:15px;">
<div id="mypassword_text" style="font-size: 10px;"></div>
<div id="mypassword_bar" style="font-size: 1px; height: 2px; width: 0px; border: 1px solid white;"></div>
</div></td>
</tr>
<tr>
<td width="150"><label for="pass2">Repeat:</label></td>

<td width="300"><input type="password" name="pass2" />
</td>
</tr>
<tr>
<td width="150"><label for="email">E-mail:</label></td>
<td width="300"><input type="text" name="email" id="email" class="required email" title="Please enter your email" />
</td>
</tr>
<tr>

<td width="150"><label for="check_mail">Repeat:</label></td>
<td width="300"><input type="text" name="check_mail" id="check_mail" class="required check_mail" title="Please enter your email" />
</td>
</tr>
<tr>
<td width="150"><label for="countries">Country:</label></td>
<td width="300">
<select name="countries"><option value="Lao People's Democratic Republic">Lao People's Democratic Republic</option></select> </td>

</tr>
<tr>
<td width="150"><label for="dob">Day of birth:</label></td>
<td width="300">
<input id="dob" name="dob" type="text" class="required DatePicker" alt="{
dayChars:3,
dayNames:['Sonntag', 'Montag', 'Dienstag', 'Mittwoch', 'Donnerstag', 'Freitag', 'Samstag'],
daysInMonth:[31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31],
format:'yyyy-mm-dd',
monthNames:['Januar', 'Februar', 'M&auml;rz', 'April', 'Mai', 'Juni', 'Juli', 'August', 'September', 'Oktober', 'November', 'Dezember'],
startDay:1,
yearOrder:'desc',
yearRange:90,
yearStart:2007
}" tabindex="1" value="1980-04-25" title="Date of Birth"/>

</td>
</tr>
<tr>

<td width="150"><label for="dob">Sex:</label></td>
<td width="300"><input type="radio" title="Sex" name="sex" value="1" class="required" />Male <input type="radio" name="sex" value="2" class="required" />Female<input type="radio" name="sex" value="3" class="required" />I don't know</td>
</tr>
<tr>
<td width="150"><label for="disclaimer">Disclaimer:*</label></td>
<td width="300"><input type="checkbox" id="disclaimer" title="Disclaimer" value="agree" class="required" /></td>

</tr>
<tr>
<td><input type="submit" name="submit_reg" value="Register" />
</td>
<td></td>
</tr>
<tr>
<td colspan="2"></p><p>After your registration an e-mail will be send to activate your account.</p><p>Untill then you're not able to login.</p><p></td>
</tr>

</table>
</form>