Magento Switcher languages not working correctly

Question

I have changed languages for flags in Magento. But now for example I change language home page localhost/website/ I click in French flag page goes localhost/website/fr make translation now I select product go to localhost/website/index.php/fr/productname now here I change language for example Italian it goes to the home page and give me this url localhost/website/index.php/fr/it

Do this for all languages

I can not solve this problem if you can help me thank you.

Here is the code languages.phtml

<?php if(count($this->getStores())>1): ?>
<div class="form-language">
    <div class="langs-wrapper">
    <?php foreach ($this->getStores() as $_lang): ?>
        <?php if ($_lang->getCode() != 'default'): ?>
        <a class="lang-flag" href="<?php echo $this->getCurrentUrl().$_lang->getCode();?>" style="text-decoration:none;" title="<?php echo $_lang->getCode();?>">
            <img src="<?php echo $this->getSkinUrl('images/flags/'.$_lang->getCode().'.gif');?>" alt="<?php echo $_lang->getCode();?>">
        </a>
        <?php endif;?>
    <?php endforeach;?>
    </div>
</div>
<?php endif;?>

Answer 1

The problem is the href: <?php echo $this->getCurrentUrl().$_lang->getCode();?>

This just takes the current url and appends the language code to it.
Replace that with

 <?php echo $_lang->getCurrentUrl(); ?>