(ASK)input content & image ke database - PHP

saya punya masalah dengan input content ke database dengan content gambar juga. sebelumnya sudah bisa, tapi ntah kenapa sekarang error blank.

input formnya spt ini.

<form class='form-horizontal' method='POST' action='save_input_problem.php' enctype='multipart/form-data'>
								        <fieldset>

								        				            <?php

								            $barkode = date('dmhis');
								            $date=date('Y-m-d');

											?>
								            <div class='form-group'>
								                <label class='col-lg-2 control-label' for='id_problem'>ID problem</label>
								                <div class='col-lg-10'>
								                    <input class='form-control' id='id_pelanggan' name='id_masalah' type='text' value='<?php echo $barkode  ?>' readonly required='required' >
								                <span class='help-block'>ID Problem</span>
								                </div>
								            </div>
 											<div class='form-inline' style="padding-bottom:50px">
								                <label class='col-lg-2 control-label' >Date / Time</label>
								                <div class='col-lg-10'>

								                    <input class='form-control' readonly=""  name='tgl' type='text'  required='required'  value=" <?php echo $date ?> ">
								                	 <input  class='form-control'  name='waktu' type='text'  required='required'value="<?php echo date("h:i:s")?>" >
								                	 </div>
								            </div>
								            <!--departemen-->
								            <div class='form-group'>
								                <label class='col-lg-2 control-label' >To Departemen</label>
								                <div class='col-lg-10'>
								                   <select  name='id_departemen'  class='selectize-select form-control' required='required'>
								                        <?php
  											$sql = mysql_query("SELECT * FROM departemen ORDER by id_departemen ");
											while($x=mysql_fetch_array($sql))
												{
													echo "<option value='$x[id_departemen]'>$x[nama_departemen]</option>";
												}
	 										 ?>
								                    </select>
								                   </div>
								            </div>

								            <!--memanggil tipe-->


								            <div class='form-group'>
								                <label class='col-lg-2 control-label' >Problem Type</label>
								                <div class='col-lg-10'>
								                   <select  name='id_kategori'  class='selectize-select form-control' required='required'>
								                        <?php
  											$sql = mysql_query("SELECT * FROM kategori_masalah ORDER by id_kategori ");
											while($x=mysql_fetch_array($sql))
												{
													echo "<option value='$x[id_kategori]'>$x[nama_kategori]</option>";
												}
	 										 ?>
								                    </select>
								                   </div>
								            </div>


											<div class='form-group'>
								                <label class='col-lg-2 control-label' >Probelm</label>
								                <div class='col-lg-10'>
								                   <textarea  class="form-control"  placeholder="what's the problem ?" name="masalah" required='required'></textarea>
								                   </div>
								            </div>


								            <div class='form-group' >
								                <label class='col-lg-2 control-label' >Location</label>
								                <div class='col-lg-10'>
								                    <input class='form-control'  name='lokasi' type='text' placeholder='Room/Place/PC' required='required' >
								                	 </div>
								            </div>

								            <div class='form-group'>
								                <label class='col-lg-2 control-label' >User</label>
								                <div class='col-lg-10'>
								                    <input class='form-control'  name='id_staff' type='text' value="<?php echo "$_SESSION[id_staff]"; ?> " readonly>
								                	 </div>
								            </div>

								             <div class='form-group'>

								                <div class='col-lg-10'>
								                   <div class="radio radio-info radio-inline">
                                                       <input type="radio" id="inlineRadio1" value="1" name="status" checked="" >

                		                           </div>
                		                           <div class="radio radio-inline radio-danger">
                              					  		<input type="radio" name="status" id="radio4" value="2" >

                           						   </div>
								                </div>
								            </div>
								            <div class='form-group'>

								                <label class='col-lg-2 control-label' >Image</label>
								                <div class='col-lg-10'>
								                    <input class='form-control'  name='file' type='file' id="fotom">
								                	 </div>
								            </div>

								            <div class='form-group'>
								                <label class='col-lg-2 control-label' for='focusedInput'></label>
								                <div class='col-lg-10'>
								                    <button type='submit' class='btn btn-primary'>Save</button>
								                	<button type='file' class='btn btn-danger'>Reset</button>
								                </div>
								            </div>

								            </fieldset>
								        </form>

nah file actionnya spt ini.

	<?php
	include "koneksi.php";
	$dir="fotom/";
	$extension=$_FILES["fotom"]['type'];
	$filename=$_FILES["fotom"]["name"];
	$filesize=$_FILES["fotom"]["size"];
	$tmpname=$_FILES["fotom"]["tmp_name"];
	if($extension=="gambar/jpeg" or $extension=="gif")
		{
			if(move_uploaded_file($tmpname,$dir,$filename))
		{
	$save=mysql_query("INSERT INTO masalah VALUES (
		'$_POST[id_masalah]',
		'$_POST[id_departemen]',
		'$_POST[id_kategori]',
		'$_POST[masalah]',
		'$_POST[lokasi]',
		'$_POST[tgl]',
		'$_POST[waktu]',
		'$_POST[id_staff]',
		$filename,
		'$_POST[status]'
		)");

		if($save)
		{
			echo"<script>
			 alert('TERSIMPAN');location.href='input_problem.php';
			 </script>";
		}

		}
		else
		{
			echo"<script>
			 alert('GAGAL');location.href='homr.php';
			 </script>";
			 }
		}
		?>

sekarang blank di url save_input_problemnya,mungkin ada yg bisa bantu.

mohon bantuannya.