Form alignment

I am having issues with my form in IE6, when the user submits any form elements that are blank call en errir in Javascript and an red invalid is printed next to the field, this works fine in FF and IE7 however when done in IE6, the form alignment is replaced with the label then the element underneath it and then the printed invalid underneath that.

here is the code

#contactForm{
float:left;
width:350px;
}
#contactDirect{
float:left;
width:170px;
}

div.row {
 clear: both;
 padding-top: 5px;
 }

div.row span.label {
 float: left;
 width: 100px;
 text-align: left;
 }

div.row span.formw {
 float:left;
 width: 235px;
 text-align: left;
}

form.cmxform {
width: 340px;
font-size: 1.0em;
color: #333;
}

form.cmxform legend, form.cmxform label {
color: #333;
}

form.cmxform fieldset {
border: none;
border-top: 1px solid #C9DCA6;
}

form.cmxform fieldset fieldset {
background: none;
}

form.cmxform label.error, label.error {
color: red;
font-style: italic
}
div.error { 
display: none; 
}
input.error { 
border: 1px solid red; 
}
textarea.error { 
border: 1px solid red; 
}
#contactForm label { 
width: 250px; 
}
#contactForm label.error, #contactForm input.submit {
margin-left: 5px; 
}

and the html

 
 <div id="contactForm">
						<img src="images/contact/fill_in_form.gif" alt="Fill in our online form"  />	
					   <p><span class="highLight">*</span> <span class="grey">Denotes mandatory field</span></p>
						<form class="cmxform" id="contact" method="post">		 
						<fieldset>			 
						<div class="row">
						  <label for="firstname"><span class="label">Name<span class="highLight">*</span></span></label><span class="formw"><input type="text" id="contactName" name="contactName" class="size"/></span>
						</div>
  							<div class="row">
						<label for="phonenumber"><span class="label">Phone Number<span class="highLight">*</span></span></label><span class="formw"> <input type="text" id="contactPhone" name="contactPhone" class="size" /></span>
						</div>
						<div class="row">
						  <label for="emailaddress"><span class="label">Email<span class="highLight">*</span></span></label><span class="formw"><input type="text" id="contactEmail" name="contactEmail" class="size" /></span>
						</div>
						<div class="row">
						  <label for="enquiry"><span class="label">Enquiry<span class="highLight">*</span></span></label>
						<span class="formw"><textarea id="contactEnquiry" name="contactEnquiry" rows="8" class="size"></textarea></span>
						</div>
						<input name="action" type="hidden" value="validate" />
						  <input name="submit" type="image" src="images/contact/send.gif" class="padOut" />
						</fieldset>
						</form>
						</div>