Font Helper problem (is not work for me....)

How can i use font helper for t2d text object?

where can i put this function in game script folder?

function loadCustomFont( %name, %size, %weight)
{
%pngdir = "pngs/";
%fontdir = "common/ui/cache/";
%fileName = %fontdir @ %pngdir @ %name SPC %size @ ".png";
importCachedFont( %name, %size, %fileName, %weight, 0);
}


and also where can i call below function for t2d text object?

loadCustomFont( "Seabird SF", 80, 0 );



anyone help???