function showProductInfoTab(){

    document.getElementById('delivery-button').className='none';
    document.getElementById('tab-delivery').style.display='none';
    document.getElementById('returns-button').className='none';
    document.getElementById('tab-returns').style.display='none';
    document.getElementById('warnings-button').className='none';
    document.getElementById('tab-warnings').style.display = 'none';
    
    document.getElementById('product-info-button').className='selected';
    document.getElementById('tab-product-info').style.display = 'block';
}

function showDeliveryTab(){

    document.getElementById('product-info-button').className='none';
    document.getElementById('tab-product-info').style.display='none';
    document.getElementById('returns-button').className='none';
    document.getElementById('tab-returns').style.display='none';
    document.getElementById('warnings-button').className='none';
    document.getElementById('tab-warnings').style.display = 'none';

    document.getElementById('delivery-button').className='selected';
    document.getElementById('tab-delivery').style.display = 'block';
}

function showReturnsTab(){

    document.getElementById('product-info-button').className='none';
    document.getElementById('tab-product-info').style.display='none';
    document.getElementById('delivery-button').className='none';
    document.getElementById('tab-delivery').style.display='none';
    document.getElementById('warnings-button').className='none';
    document.getElementById('tab-warnings').style.display = 'none';

    document.getElementById('returns-button').className='selected';
    document.getElementById('tab-returns').style.display = 'block';
}

function showWarningsTab(){

    document.getElementById('product-info-button').className='none';
    document.getElementById('tab-product-info').style.display='none';
    document.getElementById('delivery-button').className='none';
    document.getElementById('tab-delivery').style.display='none';
    document.getElementById('returns-button').className='none';
    document.getElementById('tab-returns').style.display = 'none';

    document.getElementById('warnings-button').className='selected';
    document.getElementById('tab-warnings').style.display = 'block';
}

function showMyDetailsTab(){
    
    document.getElementById('my-orders-button').className='none';
    document.getElementById('my-orders').style.display='none';

    document.getElementById('my-details-button').className='selected2';
    document.getElementById('my-details').style.display = 'block';
}

function showMyOrdersTab(){

    document.getElementById('my-details-button').className='none';
    document.getElementById('my-details').style.display='none';

    document.getElementById('my-orders-button').className='selected2';
    document.getElementById('my-orders').style.display = 'block';
}