Slider doesn't work in Internet Explorer 9. How can I fix it?
The slider filter type will not work in Internet Explorer 9 if you use Magento® version 1.5 or older. To fix this, you need to update the Prototype version from 1.6 to 1.7.
IMPORTANT! BE VERY CAREFUL WHEN DELETING OR UPDATING FILES - IT'S POSSIBLE THAT AFTER CHANGES YOUR STORE WILL NOT WORK CORRECTLY.
Step 1. Download Prototype version 1.7
You can download a new version of Prototype at http://www.prototypejs.org/download
If it opens in a new tab and doesn't allow you to download a file on your PC, use the right mouse button and then click "Save link as..."
Step 2. Replace files
Using an FTP client go to js\prototype\ and replace the old "prototype.js" file with a new one.
Step 3. Clear Cache
Go to System → Cache Management and clear the store cache.