Someone

		public function adjustTextSize (o) {
		 if (o.autosize) {
				
				var st:TextField = new TextField();
				st.type = TextFieldType.DYNAMIC;
				st.embedFonts = true;
				st.multiline = true;
				st.wordWrap = true;
				st.width = o.width;
				st.height = o.height;
				st.text = o.text;
				var tft:TextFormat = new TextFormat(usable_font_name,o.size,0xFFFFFF);
				tft.align = "center";
				
				v = 128;
				j = k = 256;
				
				var vc = 0;
				
				while (true) {
					tft.size = j;
 				tft.letterSpacing = getLetterSpacing(j);
					st.setTextFormat(tft);
					
					if (st.textHeight > o.height-8) { // too big
						j = j-v;
					} else { // not big enough?
						k = j;
						j = j+v;
					}
					v = v/2;
					if (v <= 1) {
						vc++;
						if (vc >= 5) {
							break;
						}
					}
				}
				
				if (k<12) {
					k = 12;
				}
				if (k>127) {
					k = 127;
				}
				o.size = k;
			}
		}