If you install Magento and add Products and want to add a Price Slider you see The Price looks like that 0.2000 to 200.0000 on the left navigation bar. But in Europe you need only 2 digits after the decimal point so it should look like 0.20 to 200.00 how can I change that?
you can use the same function in your slider template.
Mage::helper('core')->currency($yourPrice, true, false);
You could also do the sneaky way via PHP's number_format, i.e
echo "€ " . number_format($value, 2, ".", ",");