problem in IE passing cfform/cfselect over an ajax request

<script language="javascript">
	
 
	function init() {
	
	var building = $F('sel_building');
	
	
	
	var div = 'result';
	var url = '/ajax/index.cfm';
	
	new Ajax.Updater(div, url,{asynchronous:true, method:'post', postBody: 'building='+building});
	
	}
		
		
	function search_cats() {
 
	var building = $F('sel_building');
	var room 	 = $F('sel_rooms');
	var div = 'search_results';
	var url = '/ajax/building_select_action.cfm';
	
	$(div).update('<div class="preloader">Loading <img src="loading.gif"></div>');
	new Ajax.Updater(div, url,{asynchronous:true, method:'post', postBody: 'buildings='+building+'&rooms='+room});
	}
 
	function search_fac() {
	
	var params = $('select_facilities').serialize();
	var div = 'search_results';
	var url = '/ajax/facilities_select_action.cfm';
	$(div).scrollTo();
	$(div).update('<div class="preloader">Loading <img src="loading.gif"></div>');
 
	new Ajax.Updater(div, url, {asynchronous:true, parameters:params});	
	
	}
</script>
 
<div class="src_loc">
<h2>Search by Location</h2>
<cfquery name="get_building" datasource="afmread">
SELECT DISTINCT BL_ID
FROM RM
WHERE BU_ID=0031
</cfquery>
 
    <table cellpadding="0" cellspacing="0" border="0">
        <tr>
            <td><p>Select Building:</p></td>
            <td class="right_space">
            <!---<cfform name="select_building" id="select_building" action="building_select_action.cfm">--->
            <cfform name="select_building" id="select_building">
                
                <cfselect name="buildings" onchange="init();"
                id="sel_building"
                query="get_building"
                display="BL_ID"
                required="Yes"
                multiple="No"
				selected="none"
				queryPosition="below"
                size="1">
				<option value="none">-- Select a Building --</option>
                </cfselect>
            </td>
            <td><p>Room:</p></td>    
            <td class="right_space">	
		<div id="result">
                <select id="sel_rooms" name="rooms">
                <option value="0">-- Select a Room --</option>
                </select></div>
            </td>
            <td>
                <input type="button" id="cats_submit" value="Search" OnClick="search_cats();"/>
            </td>
            </cfform>
            
</tr>
    </table>
</div>
 
<div class="src_fac">
<h2>Search by Facilities</h2>
<table cellpadding="0" cellspacing="0" border="0">
    <tr>
        <td class="right_space">
 
                <cfform name="select_facilities" id="select_facilities" action="facilities_select_action.cfm">
                <input type="checkbox" id="dvdvcr" name="dvdvcr" value="true" /> Access to DVD/VCR Combo<br />
                <input type="checkbox" name="vcr" value="true" /> Access to VCR<br />
                <input type="checkbox" name="ohp" value="true" /> Access to O/H Projector<br />
                <input type="checkbox" name="dataproj" value="true" /> Has Data Projector<br />
        </td>
        <td class="right_space"> 
        	<input type="checkbox" name="netports" value="true" /> Has Network Ports<br />       
                <input type="checkbox" name="wap" value="true" /> Wireless Network Access<br />
                <input type="checkbox" name="phone" value="true" /> Has Telephone Ports<br />
                <input type="checkbox" name="vidscreen" value="true" /> Has Video Screen<br />
                
 
        </td>
        
    </tr>
    <tr>
    	<td style="padding-top:10px;"><input id="cats_submit" type="button" value="Click here to Search" OnClick="search_fac();"/></td></tr>
    </cfform>
 
</table>
</div>
 
<hr />
 
<div id="search_results"></div> 
</body>
</html>