unescape in code

unescape in code

I'm doing some custome html view, and i'm making an external link where i want to provide the parameters unescaped.
However, if i do 



<a href="someurl.com?<%=unescape('a=1&b=2')%>">Bla</a>




The code editor wont let me, saying there is an error.

How do i do this?