Simple JS to block - help

[DesignzShop]

Not sure how to go about this. I have a account with another company that gives a certain code to put into your html page they say should work. Chances are it does I'm just implementing it wrong. Can't get it to show in a custom block on a pages automated created page.

 

<a href='#' onclick='var w=window.open("https://shop.mysite.com/?shop=xxxx&tags=25","2222222222222","width=1000,height=820,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1"); w.focus(); return false;'>mysiteurl</a>