Nowadays it's very common to not support any more old browsers. Still, when a user with an IE7 comes to visit your website it's not really user friendly to display a blank page. This small script simply displays a message explaining the problem and propose the user to download Google Chrome. Example:
To use it, just put this code at the bottom of your web page:
<!--[if lt IE 10]>
<script src="https://cdn.rawgit.com/nicolas-van/install-chrome-dialog/0.1.0/install-chrome-dialog.min.js"></script>
<script>installChrome();</script>
<![endif]-->
Currently this script is only tested using the emulation mode of a recent IE. If you have VMs with old IEs and want to test it, I'll gladly accept any merge proposal to improve the support.