Add image at form submit I have created a form that has a submit button.

$form['products_submit'] = array(
    '#type' =&gt; 'submit',
    "#id"  =&gt; "submit_first",
    '#value' =&gt; t('Submit'),
    '#ajax' =&gt; array(
                'callback' =&gt; 'products_submit_driven_callback',
                'method' =&gt; 'replace',
                'effect' =&gt; 'fade',
                'progress' =&gt; array('type' =&gt; 'none'),
            ),
            '#prefix' =&gt; '&lt;div class="button-logged-in"&gt;',
        '#suffix' =&gt; '&lt;/div&gt;'
    );

  return $form;


And I want to add an image inside the button, at the left of 'Submit' text. I tried to add the img tag inside the t function but it just showed the code and not the image. Does anyone know how can I manage this?
You can handle this from CSS.

Like : 

.button-logged-in.input{
    background-image: url(/images/buttons/submit.png);
}


Example : https://stackoverflow.com/questions/2920076/html-css-how-to-add-image-icon-to-input-type-button