Insert data and Images using same php form

[ghjk]

I want to add form data and images using one form in php. I'm using php,ajax and mysql.When I run images insert code and data insert code seperately ; they worked. But when I put in the same php form data insert part doesn't work. Please tell me where I goes wrong
This is my php page

[LEFT]<?php 
session_start();
require_once ('dbconnect.php');
require_once ('commonFunctions.php');

<script language="javascript" src="ajax.js"></script>


<script type="text/javascript">
function add_file_field(){
var container=document.getElementById('file_container');
var file_field=document.createElement('input');
file_field.name='images[]';
file_field.type='file';
container.appendChild(file_field);
var br_field=document.createElement('br');
container.appendChild(br_field);
}
</script>

</head>

<?

$make= "";


if(isset($_GET['Submit'])==2){
	$make=$_GET['make'];
	getVehicleModel($make);
	return;
}	

if(isset($_GET['S'])==1){

echo $make;
	$make=$_GET['make'];
	$model=$_GET['model'];
	$type=$_GET['type'];
	$year=$_GET['year'];
	$month=$_GET['month'];
	$fuel=$_GET['fuel'];
	$transmission=$_GET['transmission'];
	$displacement=$_GET['displacement'];
	$color=$_GET['color'];
	$milage=$_GET['milage'];
	$price=$_GET['price'];
	$other=$_GET['other'];
//---------------------insert data to vehicles table-------------------------------------------	
	$sql = "INSERT INTO vehicles VALUES('','$make','$model','$type','$year','$month','$fuel','$transmission','$color','$price','$displacement','$milage','$other')";
	
	$result = mysql_query($sql);
	echo "SUCCESS";
	
	
	//$vehicles_pk = mysql_insert_id();
	
	if (!$result) 
		{
			echo "Error in SQL query: " . mysql_error();
		}
		else{
		
			$message = "<p class=message>Successfully Inserted !</p>";
		 }

	return;
	}
	
	
	
	if (isset($_POST['Submit'])) {
    $number_of_file_fields = 0;
    $number_of_uploaded_files = 0;
    $number_of_moved_files = 0;
    $uploaded_files = array();
    $upload_directory = dirname(__file__) . '/vehicles/'; 
   

     
    for ($i = 0; $i < count($_FILES['images']['name']); $i++) {
        $number_of_file_fields++;
        if ($_FILES['images']['name'][$i] != '') { 
            $number_of_uploaded_files++;
            $uploaded_files[] = $_FILES['images']['name'][$i];
            if (move_uploaded_file($_FILES['images']['tmp_name'][$i], $upload_directory . $_FILES['images']['name'][$i])) {
                $number_of_moved_files++;
            }
 
        }
 
    }

	$name= implode(',', $uploaded_files);
	echo $name;
	
	
}
?>



<table width="566" height="100%" border="0" align="center" cellpadding="0" cellspacing="0"  >
  
  <!--------------body-------------------------------------------------------------->
 	<tr>
		<td>
		<form name="frm"  method="post" enctype="multipart/form-data" action="">
		<!--<form id="addvehicle" method="post" enctype="multipart/form-data"  name="addvehicle">-->
			<table cellspacing="5"><br />
			<tr><td colspan="2"><?   //echo $message; ?></td></tr>
				<tr>
					<td>Make :</td> 
					<td>
					<?php getVehicleMake(); 
					?>
					
				  </td>
					 <!--<td>Add New</td>
					 <td><input name="" type="radio" value="" /><input name="c" type="text" value="" /></td>-->
			  </tr>
					<tr>
<? //------------------ this is reciveing ajax sending selected vahicle make-------------------------- ?>					
					
					<td>Model :</td> 
					<td>
					<div id='txtHint'>
					<?
					getVehicleMakeForStockAdmin($make);
					?>
					</div>		
					</td>
				</tr>
				<tr>
					<td>Type :</td> 
					<td colspan="3">
					<? getVehicleType();?>
					</td>
				</tr>

				<tr>
					<td>Year :</td>
					 <td><? getVehicleYear(); ?>Month :<? getVehicleMonth(); ?>
					 </td>
				</tr>
				
				
				<tr><td>Images</td>
				<td>
				  <div id="file_container">
    			<input name="images[]" type="file"  />
   				 <br />
  				</div>
 				 <a href="javascript:void(0);" onClick="add_file_field();">Add another</a><br />
 				</td>
				
				</tr>
				</form> 
				<tr>
					<td align="right" colspan="2">
					  
<button type="submit" name="Submit" style="border: 0; background: transparent; cursor: pointer;" onclick="addVehicle();">   			<img src="http://bytes.com/images/searchBtn.jpg"  />
			</button>
			</td>
				</tr>
			</table>
			
		</td>
	</tr>
 	
	<tr>
    	<td><?php require_once 'footer.php'; ?>
  		</td>
  	</tr>
</table>

<!-------------------------end stock search---------------------------------------- -->
</body>[/LEFT]
</html>

This is ajax code to get data

function addVehicle(){
	
	var dropdownIndex = document.getElementById('Make').selectedIndex;
	var make = document.getElementById('Make')[dropdownIndex].value;
	var dropdownIndex = document.getElementById('Model').selectedIndex;
	var model = document.getElementById('Model')[dropdownIndex].value;
	var dropdownIndex = document.getElementById('Type').selectedIndex;
	var type = document.getElementById('Type')[dropdownIndex].value;
	var dropdownIndex = document.getElementById('Year').selectedIndex;
	var year = document.getElementById('Year')[dropdownIndex].value;
	

				
	var request = GetXmlHttpObject();
	var url="stockAdmin.php";
	url=url+"?make="+make+"&model="+model+ "&type="+type+ "&year="+year+"&S="+1;
				
	
	url=url+"&sid="+Math.random();
	request.onreadystatechange=stateChanged;
	request.open("GET",url,true);
	
;
	request.send(null);

	function stateChanged()
   {
	 if (request.readyState==4)  
		{
			
			document.getElementById("a").innerHTML=request.responseText;
			document.frm.reset();
			  
		}
 	}
	
}