def escape_symbols(txt)
			esc = ''
			txt.to_s.each_byte { |byte|
				esc << if(entity = @@symbol_entities[byte])
					'&' << entity << ';'
				else
          byte
				end
			}
			esc
		end
def escape_symbols(txt)
			esc = ''
			txt.to_s.each_byte { |byte|
				esc << if(entity = @@symbol_entities[byte])
					'&' << entity << ';'
				else
          byte
				end
			}
			esc
		end
escape symbol-font strings