Mysterious space in my img

hi, i make this form, at my radio button, the images have space at the bottom in IE6, what is the caused of that?(fine in Firefox)
i tried margin:0, padding: 0, display: block, but it doest help, is anyone know bout it?
thanks!

i deleted some non relevant code
html (the problems is at line 46):


<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
        <title>test</title>
        <link rel = "stylesheet" href = "css/version4.css" type = "text/css" />
        <link rel = "stylesheet" href = "css/import.css" type = "text/css" media = "screen,print" />
    
    </head>
    
    <body>
                    <div class = "bbs_box"><!-- start bbs_box -->
                        <div class = "clearfix"><!-- start clearfix -->
                            <form action = "index.php?ID=bbs" method = "post">
                                
                                <div id = "bbs_form_box1">
                                    <fieldset>
                                        <label class = "label" for = "bbs_input_name">
                                            Name:
                                        </label>
                                        <span class = "control">
                                            <input type = "text" id = "bbs_input_name" name = "bbs_name" value="" />
                                        </span>
                                        <label class = "label" for = "bbs_input_email">
                                            Email:
                                        </label>
                                        <span class = "control">
                                            <input type = "text" id = "bbs_input_email" name = "bbs_email" value = "" />
                                        </span>
                                        <label class = "label" for = "bbs_input_url">
                                            URL:
                                        </label>
                                        <span class = "control">
                                            <input type = "text" id = "bbs_input_url" name = "bbs_url" value = "" />
                                        </span>
                                    </fieldset>
                                </div>
                            
                                <div id = "bbs_form_box2">
                                    <fieldset>
                                        <label class = "label_comment" for = "bbs_textarea_comment">Comment:</label>
                                        <span class = "control_comment"><textarea id = "bbs_textarea_comment" name = "bbs_msg" rows = "4" cols = "25"></textarea></span>
                                    </fieldset>
                                </div>
                                
                                <div class = "bbs_form_box3">
                                    <fieldset>
                                        <label class = "label_image" for = "bbs1">
                                            <input class = "radio" type = "radio" id = "bbs1" name = "bbs_img" value = "bbs1.jpg" />
                                        </label>
                                        <span class = "control_image">
                                            <img src = "images/bbs/bbs1.jpg" height = "25px" width = "25px" alt = "bbs1" />
                                        </span>
                                    </fieldset>
                                
                                    <fieldset>
                                        <label class = "label_image" for = "bbs2">
                                            <input class = "radio" type = "radio" id = "bbs2" name = "bbs_img" value = "bbs2.jpg" />
                                        </label>
                                        <span class = "control_image">
                                            <img src = "images/bbs/bbs2.jpg" height = "25px" width = "25px" alt = "bbs2" />
                                        </span>
                                    </fieldset>
                                    
                                    <fieldset>
                                        <label class = "label_image" for = "bbs3">
                                            <input class = "radio" type = "radio" id = "bbs3" name = "bbs_img" value = "bbs3.jpg" />
                                        </label>
                                        <span class = "control_image">
                                            <img src = "images/bbs/bbs3.jpg" height = "25px" width = "25px" alt = "bbs3" />
                                        </span>
                                    </fieldset>
                                    
                                </div>
                                    
                                <div id = "submit_post_bbs">
                                    <input type = "submit" name = "bbs_submit" value = "Post It" />
                                </div>
                                
                            </form>
                        </div><!-- end clearfix -->
                    </div><!-- end bbs_box -->
    
    </body>
</html>

css: (the error i guess is at line 159,224,230)


/* Body 
---------------------------------------------------------------------- */
* {
  margin: 0;
  padding: 0;
}
html, body {
  height: 100%; /* Required */
}
body {
    font-size: 11px;
    font-family: Arial;
    color: #000066;
    background: #ffffff url(../images/common/bg.gif) repeat-y;
}
#wrapper {
    width: 720px;
    text-align: left;
    position: relative;
    min-height: 100%; /* For Modern Browsers */
    height: auto !important; /* For Modern Browsers */
    height: 100%; /* For IE */
}
.clearfix:after {    
    content: "."; 
    display: block; 
    height: 0; 
    clear: both; 
    visibility: hidden;
}

.clearfix {display: inline-block;}

/* Hides from IE-mac \*/
* html .clearfix {height: 1%;}
.clearfix {display: block;}
/* End hide from IE-mac */

/* Page Body 
---------------------------------------------------------------------- */
#pagebody {
    width: 700px;
    padding-left: 10px;
}
#pagebody:after {
  clear: both;
  display: block;
  font: 1px/0px serif;
  content: ".";
  height: 0;
  visibility: hidden;
}

/* Content 
---------------------------------------------------------------------- */
#content {
    display: inline;
    margin-top: 20px;
    margin-bottom: 30px;
    float: right;
    width: 520px;
    padding: 0 0 0 20px;
    border-left: 1px solid #000066;
}
#content h1 {
    margin: 0;
    padding-left: 10px;
    padding-top: 3px;
    height: 17px;
    font-size: 12px;
    font-weight: bold;
    color: #ffffff;
    background: #000066 url(../images/common/title_bar.gif) no-repeat;
}

/* BBS
------------------------------------------------------- */
.bbs_box {
    padding: 0 0 10px 0;
    margin-top: 10px;
    width: 520px;
    border-width: 1px;
    border-color: #000066;
    border-style: none none dotted none;
}
.bbs_box p {
    color: red;
    padding-bottom: 5px;
    font-size: 10px;
}
.bbs_date {
    margin-right: 10px;
    margin-bottom: 10px;
    float: left;
    padding-left: 24px;
    font-weight: bold;
    font-size: 12px;
    background: url(../images/common/clock_icon_s.gif) left center no-repeat;
}
.bbs_name {
    float: left;
    margin-bottom: 10px;
    padding-left: 21px;
    font-weight: bold;
    font-size: 12px;
    background: url(../images/common/name_icon_s.gif) left center no-repeat;
}
.bbs_img {
    clear: both;
    float: left;
    margin-right: 10px;
    border: 1px solid #000066;
}
.bbs_msg {
    margin-bottom: 5px;
    float: left;
    width: 450px;
    line-height: 1.2;
    overflow: hidden;
}
.bbs_url {
    display: inline;
    clear: both;
    float: left;
    margin-left: 60px;
    padding-left: 26px;
    color: #999999;
    width: 90px;
    background: url(../images/common/link_icon_s.gif) left center no-repeat;
}
.bbs_url a {
    color: #999999;
}
.bbs_url a:hover {
    color: #ff6666;
}
.bbs_email {
    float: right;
    padding-left: 23px;
    color: #999999;
    background: url(../images/common/email_icon_s.gif) left center no-repeat;
}
.bbs_email a {
    color: #999999;
}
.bbs_email a:hover {
    color: #ff6666;
}
#bbs_form_box1 {
    float: left;
    height: 110px;
    margin: 0;
}
#bbs_form_box2 {
    float: left;
    margin-right: 0;
    margin-left: 6px;
}
.bbs_form_box3 {
    width: 520px;
    clear: both;
    float: left;
    margin-top: 5px;
    padding: 0;
    height: 25px;
}


/* Form Stuffs
------------------------------------------------------- */
form {
    margin: 0;
}
fieldset {
    float: left;
    margin: 0;
    padding: 0;
    border: none;
}
input, select, textarea {
    border-style: solid;
    border-width: 1px;
    border-color: #aaaa94 #dfdfd6 #dfdfd6 #aaaa94;
    color: #999999;
    background: #f1f1ed;
}
input.radio {
    border-style: none;
    color: #000000;
    width: 10px;
    height: 9px;
    background: transparent;
}
.label {
    clear: both;
    display: block;
    padding-bottom: 0.5em;
    padding-top: 0.8em;
    float: left;
    width: 35px;
    line-height: 1em;
}
.control {
    display: block;
    margin: 0 5px 0 40px;
    padding-top: 0.5em;
    padding-bottom: 1em;
    
}
.label_comment {
    clear: both;
    display: block;
    padding-bottom: 0.5em;
    padding-top: 0.5em;
    float: left;
    line-height: 1em;
}
.control_comment {
    display: block;
    clear: left;
    margin: 0;
    padding-bottom: 1em;
}
.label_image {
    margin: 0;
    padding: 0;
    display: block;
    float: left;
}
.control_image {
    padding: 0;
    border: 1px solid #000066;
    display: block;
    margin-top: 0;
    margin-bottom: 0;
    margin-left: 13px;
    margin-right: 8px;
    width: 25px;
    height: 25px;
}

/* Width settings of input parts
------------------------------------------------------- */
#bbs_input_name, #bbs_input_email, #bbs_input_url {
    width: 220px;
}
#bbs_textarea_comment {
    width: 240px;
    height: 70px;
}
/* Transmission button
------------------------------------------------------- */
#submit_search input {
    margin-top: 8px;
    float: right;
    border-width: 1px;
    border-color:#dfdfd6 #aaaa94 #aaaa94 #dfdfd6;
    width: 5em;
    color: #999999;
    font-size: 10px;
    background: #dfdfdf;
}
#submit_post_bbs input {
    margin-top: 10px;
    float: right;
    border-width: 1px;
    border-color:#dfdfd6 #aaaa94 #aaaa94 #dfdfd6;
    width: 5.2em;
    color: #999999;
    background: #dfdfdf;
}

i attached the problems links too,
html:
http://www.nanaku4design.com/problem/bbs.html

css:
http://www.nanaku4design.com/problem/css/base.html

thanks!