[haml] sass to scss and css expressions for IE6

[Zig]

Hi!
I'm trying to convert sass to scss and in one of my sass files I have
this:
#mail-wrp
  // Min-width for IE6
  width: expression(d=document.compatMode=="CSS1Compat" ?
documentElement:document) && (d.clientWidth < #{!pg_min_width + 1} ?
"#{!pg_min_width}px" : "auto")

This compiles to CSS without any problems, but when I convert the
above code to scss syntax:
#mail-wrp {
  // Min-width for IE6
  width: expression(d=document.compatMode=="CSS1Compat" ?
documentElement : document) && (d.clientWidth < #{$pg_min_width + 1} ?
"#{$pg_min_width}px" : "auto");
  }

Compiler says:
Sass::SyntaxError at /css/ie6.css
Invalid CSS after "...nt : document) ": expected ";", was "&&
(d.clientWid..."
Ruby    content/sass/ie6.scss: in nil, line 13

I can't understand what is wrong?

Thanks in advace!
Zig

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