public byte BoolOp(String op) {
		if ("==".equals(op)) { 
			return ScriptType.IF_TRUE_CMD;
		} else if ("!=".equals(op)) { 
			return ScriptType.IF_FALSE_CMD;
		} else if ("<=".equals(op)) {
			return ScriptType.IF_SMALLER_EQU_CMD;
		} else if (">=".equals(op)) { 
			return ScriptType.IF_BIGGER_EQU_CMD;
		} else if ("<".equals(op)) {
			return ScriptType.IF_SMALLER_CMD;
		} else if (">".equals(op)) {
			return ScriptType.IF_BIGGER_CMD;
		}
		NormalError("syntax error");
		return -1;
	}