pdf nao abre no IE

pdf nao esta abrindo

eu clico em arkivos com a extensao pdf,abre outra janela,ae fala q ta fazendo o download,mas nao pergunta se kero salvar ou abrir,e da pagina nao encontrada as vzs,mas na maioria das vzs nao abre nda fik tdo branco,nao aparece o acrobat dentro do IE como d costume

pq sera?

conecta();

$sql = "SELECT dados FROM documentosdados WHERE id=". $_REQUEST["id"];
$ret = mysql_query($sql,$db_g) or exit("Erro SQL 1!");
$sql2 = "SELECT id,nome FROM documentos WHERE id=". $_REQUEST["id"];
$ret2 = mysql_query($sql2,$db_g) or exit("Erro SQL 2!");

$dados = mysql_result($ret,0,"dados");
$nome = mysql_result($ret2,0,"nome");

$extensao=explode(".",$nome);
$indices=count($extensao);
$extensao=$extensao[$indices-1];

switch( $extensao ) {

	case "txt": $mime = "text/plain"; break;
	case "pdf": $mime = "application/pdf"; break;
	case "doc": $mime = "application/msword";break;
	case "dot": $mime = "application/msword";break;
	case "xlw": $mime = "application/vnd.ms-excel";break;
	case "xlt": $mime = "application/vnd.ms-excel";break;
	case "xls": $mime = "application/vnd.ms-excel";break;
	case "xlm": $mime = "application/vnd.ms-excel";break;
	case "xlc": $mime = "application/vnd.ms-excel";break;
	case "xla": $mime = "application/vnd.ms-excel";break;
	case "xls": $mime = "application/vnd.ms-excel";break;
	case "xml": $mime = "application/vnd.ms-excel";break;
	case "ppt": $mime = "application/vnd.ms-powerpoint";break;
	case "pps": $mime = "application/vnd.ms-powerpoint";break;
	case "pot": $mime = "application/vnd.ms-powerpoint";break;
	case "exe": $mime = "application/octet-stream";break;
	case "bin": $mime = "application/octet-stream";break;
	case "dll": $mime = "application/octet-stream";break;
	case "zip": $mime = "application/zip";break;
	case "mid": $mime = "audio/midi";break;
	case "mp3": $mime = "audio/mpeg";break;
	case "mp2": $mime = "audio/mpeg";break;
	case "mpga": $mime = "audio/mpeg";break;
	case "aifc": $mime = "audio/x-aiff";break;
	case "aif": $mime = "audio/x-aiff";break;
	case "jpg": $mime = "image/jpeg";break;
	case "JPG": $mime = "image/jpeg";break;
	case "jpeg": $mime = "image/jpeg";break;
	case "JPEG": $mime = "image/jpeg";break;
	case "jpe": $mime = "image/jpeg";break;
	case "JPE": $mime = "image/jpeg";break;
	case "bmp": $mime = "image/bmp";break;
	case "gif": $mime = "image/gif";break;
	case "ief": $mime = "image/ief";break;
	case "png": $mime = "image/png";break;
	case "tif": $mime = "image/tiff";break;
	case "tiff": $mime = "image/tiff";break;
	case "css": $mime = "text/css";break;
	case "htm": $mime = "text/html";break;
	case "html": $mime = "text/html";break;
	case "mpe": $mime = "video/mpeg";break;
	case "mpeg": $mime = "video/mpeg";break;
	case "mpg": $mime = "video/mpeg";break;
}
header("Content-type: $mime");
header("Content-Disposition: inline;filename=\"$nome\";");
echo $dados;
mysql_close($db_g);