[amibroker] Question about comparisons

[interfool]

I'm trying to scan for stocks that are X amount below the 8 MA.

Here's the code I have so far. Doesn't work. I also would like to see
the value of MA(Close,8) when I run the scan, so I know what values
would be good to start with. Code snippet:

_SECTION_BEGIN("Basic Params");
MA8Multi = Param("MA 8 Multiplier",.9,.000001,100,.01) ;
_SECTION_END();

Buy = MA(  Close , 8 ) > Close * MA8Multi ; 

What am I doing wrong? 

Thanks,

ol' interfool