wp_handle_upload

Hello, I am trying to add a custom logo upload to default twentyeleven theme options but it does not work. So what I am doing:
I added input file in theme-options like this:

function cottoncandy_settings_field_logo() {
	$options = cottoncandy_get_theme_options();
		?>
				<input type="file" name="import" size="40" />

				<img src="<?php echo $file['url'] ?>" />
		<?php
}

Then created a function for file upload according to WP Codex – http://codex.wordpress.org/Function_Reference/wp_handle_upload#Source_File

function cottoncandy_settings_field_logo() {
	$options = cottoncandy_get_theme_options();
		?>
				<input type="file" name="import" size="40" />

				<img src="<?php echo $file['url'] ?>" />
		<?php
}

But files don’t uploads to upload directory but there are no errors. Could anybody tell me what I am wrong? Thanks.