why does floated <input> control floated component slip over too distant right ie7, nonetheless firefox?

hopefully settlement value thousand lines formula since i don't wish have frame down asp.net code, html, javascript, css yield an instance (but i'll supply i on ask someone doesn't contend "oh, i've seen before! try this...") [actually, i post formula css - bottom question].

here apportionment form page being displayed firefox:

the blue boxes surrogate stylings <label> add-on orange lines surrogate border styles <div> tags (so i where extend break). <label>'s styled float: left <div's right. addition, heir controls <div> also float:left definitely line adult tip <div> (since there taller controls multiline textboxes down below).

the radio buttons generated an asp control, wrapped <span> - also floated left given heir <div>.

here same apportionment shade rendered ie7:

there few teenager digest differences, nonetheless large that's pulling me crazy additional white space beside <input> controls! note <span>'s around radio buttons checkboxes line adult correctly.

although aren't shown, same thing happens drop-down lists list boxes. i haven't attempted jacket quarrel controls <span>, nonetheless competence work. it's an dizzy hack, though.

i've attempted several ie7 workarounds box issues i've edited css until i'm pristine spell mode (i.e., origination futile changes anticipating something works). i said, i wish someone feeling during say, "i've seen before! try this..."

anyone?

followup 1:

i'm controlling xhtml 1.0 transitory <doctype>, i should standards mode.

followup 2:

here little dash generated formula above (the initial control final control). note formula generated asp.net following boldly edited javascript/jquery.

 <fieldset id="requestinformation">
   <legend>request information</legend>
   <ol>
     <li>
       <label id="ctl00_contentplaceholder1_txtrequestdate_l" class="stdlabel" 
         for="ctl00_contentplaceholder1_txtrequestdate">request date:</label>
       <div class="formgroup">
         <input id="ctl00_contentplaceholder1_txtrequestdate" class="rsv datetextbox hasdatepicker" 
           type="text" value="10/05/2004" name="ctl00$contentplaceholder1$txtrequestdate"/>
         <img class="ui-datepicker-trigger" src="/project/images/calendar_schedulehs.png" alt="..." title="..."/>
         <span id="txtrequestdate_error"/>
       </div>
     </li>
     --stuff deleted here--
     <li>
       <label id="ctl00_contentplaceholder1_chkappealed_l" class="stdlabel" 
         for="ctl00_contentplaceholder1_chkappealed"> ask appealed?</label>
       <div class="formgroup">
         <span class="stdcheckbox">
           <input id="ctl00_contentplaceholder1_chkappealed" type="checkbox" name="ctl00$contentplaceholder1$chkappealed"/>
         </span>
       </div>
     </li>
   </ol>
 </fieldset>

here applicable apportionment css (i double checked certain duplicates problem):

div
{
    border-style: solid;
    border-width: thin;
    border-color:orange;
}

label
{
    border-style: solid;
    border-width: thin;
    border-color:blue;
}

.formgroup
{
    float:left;
    margin-left: 1em;
    clear: right;
    width: 75em;
}

.formgroup > *
{
    float:left;
    background-color: yellow;
}

fieldset ol
{
    list-style: none;
} 

fieldset li
{
    padding-bottom: 0.5em;
} 

li > label:first-child
{
    display: block;
    float: left;
    width: 10em;
    clear: left;
    margin-bottom: 0.5em;
}

em
{
    color: red;
    font-weight: bold;
}

solution!

matthew separate me page problem. quarrel boxes inheriting left margins containing elements. fortitude i chose hang any <input> component an unstyled <span>. i've perplexing keep structure html semantically sound possible, i solved controlling jquery management $(document).ready() function:

//ie domain fix: 
//  http://www.positioniseverything.net/explorer/inherited_margin.html
jquery.each(jquery.browser, function(i) {
    if($.browser.msie){
        $(":input").wrap("<span></span>");
    }
});

note wholly supplement ridiculous <span>'s ie...

stack rescue again!