Need third text area instead third dropdown

[freakymitra]

Hi Friends,

 

I have one script, where i need third drop down to be text area on changing second drop down. Check below link

http://krishnaetech.com/pc-cost-calculator/Trial/

 

 --- index.php----
    <td ><div id="citydiv"><select name="city">
<option>Select State First</option>
        </select></div></td>

 

 --- index.php--- --Head code--
<script language="javascript" type="text/javascript">
function getXMLHTTP() { //fuction to return the xml http object
	var xmlhttp=false;	
	try{
		xmlhttp=new XMLHttpRequest();
	}
	catch(e)	{		
		try{			
			xmlhttp= new ActiveXObject("Microsoft.XMLHTTP");
		}
		catch(e){
			try{
			xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
			}
			catch(e1){
				xmlhttp=false;
			}
		}
	}

	return xmlhttp;
    }

function getState(countryId) {		

	var strURL="findState.php?country="+countryId;
	var req = getXMLHTTP();

	if (req) {

		req.onreadystatechange = function() {
			if (req.readyState == 4) {
				// only if "OK"
				if (req.status == 200) {						
					document.getElementById('statediv').innerHTML=req.responseText;						
				} else {
					alert("There was a problem while using XMLHTTP:\n" + req.statusText);
				}
			}				
		}			
		req.open("GET", strURL, true);
		req.send(null);
	}		
}
function getCity(countryId,stateId) {		
	var strURL="findCity.php?country="+countryId+"&state="+stateId;
	var req = getXMLHTTP();

	if (req) {

		req.onreadystatechange = function() {
			if (req.readyState == 4) {
				// only if "OK"
				if (req.status == 200) {						
					document.getElementById('citydiv').innerHTML=req.responseText;						
				} else {
					alert("There was a problem while using XMLHTTP:\n" + req.statusText);
				}
			}				
		}			
		req.open("GET", strURL, true);
		req.send(null);
	}

}
</script>

 

 ------findcity.php
?>
<select name="city">
<option>Select City</option>
<? while($row=mysql_fetch_array($result)) { ?>
<option value><?=$row['city']?></option>
<? } ?>

 

But when i change the code in index.php i.e. drop down to text area input.. i get prompt message XMLHTTP header error. I need last drop down should be text area with integer value

 

Guys help me for this...

 

Thanks in advance

Ravi