file upload: validate if file is image

hi everyone,

in relation,this seems not like a big deal (maybe cause i spent the
whole weekend figuring out ajax), but somehow i dont get it done. when
the user is selectig a file for an upload, i wanna make sure it's an
image.

so far i am checking in my controller

if (($this->data['User']['name']['type'] != 'image/jpeg') ||
($this->data['User']['name']['type'] != 'image/png') || ($this-
>data['User']['name']['type'] != 'image/gif')) {

$this->set('error','Du kannst nur Bilder hochladen(jpeg, png,
gif)');
$this->render('previewprofileimage','ajax');

} else {
process upload and resize
}

now what happens is, that even if the file is an image cake won't see
it. i guess sth with the or operator is messed up???

that's the form btw: the .ctp-file
<?php
echo $form->create('User',
array('name'=>'uploadProfileImageForm','id'=>'uploadProfileImageForm','type'=>'file'));
echo $form->file('User');
?>

<button
onClick="ajaxUpload(this.form,'editprofile','image_preview','&lt;br /
&gt;&lt;img src=\'../img/icons/loader.gif\' width=\'16\' height=\'16\'
border=\'0\' /&gt;','Error in upload'); return false;"
type="button">Hochladen</button>

<?php
echo $form->end();
?>

thx a lot :)

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