static boolean isAttachment(String string) 
{
            return (string.equals("fixed") || string.equals("scroll"));
}

 static boolean isColor(String string) 
{
            return (CSS.stringToColor(string) != null);
}

 static boolean isImage(String string) 
{
            return (string.startsWith("url(") && string.endsWith(")"));
}

 static boolean isPosition(String string) 
{
            return (string.equals("top") || string.equals("bottom") ||
                    string.equals("left") || string.equals("right") ||
                    string.equals("center") ||
                    (string.length()  > 0 &&
                     Character.isDigit(string.charAt(0))));
}

 static boolean isRepeat(String string) 
{
            return (string.equals("repeat-x") || string.equals("repeat-y") ||
                    string.equals("repeat") || string.equals("no-repeat"));
}

 static  void parseShorthandBackground(CSS css,
    String value,
    MutableAttributeSet attr) 
{
            String[] strings = parseStrings(value);
            int count = strings.length;
            int index = 0;
            // bitmask: 0 for image, 1 repeat, 2 attachment, 3 position,
            //          4 color
            short found = 0;
            while (index <  count) {
                String string = strings[index++];
                if ((found & 1) == 0 && isImage(string)) {
                    css.addInternalCSSValue(attr, CSS.Attribute.
                                            BACKGROUND_IMAGE, string);
                    found |= 1;
                }
                else if ((found & 2) == 0 && isRepeat(string)) {
                    css.addInternalCSSValue(attr, CSS.Attribute.
                                            BACKGROUND_REPEAT, string);
                    found |= 2;
                }
                else if ((found & 4) == 0 && isAttachment(string)) {
                    css.addInternalCSSValue(attr, CSS.Attribute.
                                            BACKGROUND_ATTACHMENT, string);
                    found |= 4;
                }
                else if ((found & 8) == 0 && isPosition(string)) {
                    if (index <  count && isPosition(strings[index])) {
                        css.addInternalCSSValue(attr, CSS.Attribute.
                                                BACKGROUND_POSITION,
                                                string + " " +
                                                strings[index++]);
                    }
                    else {
                        css.addInternalCSSValue(attr, CSS.Attribute.
                                                BACKGROUND_POSITION, string);
                    }
                    found |= 8;
                }
                else if ((found & 16) == 0 && isColor(string)) {
                    css.addInternalCSSValue(attr, CSS.Attribute.
                                            BACKGROUND_COLOR, string);
                    found |= 16;
                }
            }
            if ((found & 1) == 0) {
                css.addInternalCSSValue(attr, CSS.Attribute.BACKGROUND_IMAGE,
                                        null);
            }
            if ((found & 2) == 0) {
                css.addInternalCSSValue(attr, CSS.Attribute.BACKGROUND_REPEAT,
                                        "repeat");
            }
            if ((found & 4) == 0) {
                css.addInternalCSSValue(attr, CSS.Attribute.
                                        BACKGROUND_ATTACHMENT, "scroll");
            }
            if ((found & 8) == 0) {
                css.addInternalCSSValue(attr, CSS.Attribute.
                                        BACKGROUND_POSITION, null);
            }
            // Currently, there is no good way to express this.
            /*
            if ((found & 16) == 0) {
                css.addInternalCSSValue(attr, CSS.Attribute.BACKGROUND_COLOR,
                                        null);
            }
            */
}

Parses the shorthand font string value, placing the result in attr.