wffweb/src/main/java/com/webfirmframework/wffweb/css/css3/BorderImageSource.java
public void setImageUrls(final String... imageUrls) {
        if (imageUrls == null) {
            throw new NullValueException("imageUrls is null");
        }
        final StringBuilder sb = new StringBuilder();
        for (int i = 0; i < imageUrls.length; i++) {
            sb.append("url(\"").append(imageUrls[i]).append("\")");
            if (i < imageUrls.length - 1) {
                sb.append(", ");
            } else {
                sb.append(' ');
            }
        }
        setCssValue(StringBuilderUtil.getTrimmedString(sb));
        this.imageUrls = imageUrls;
    }
public void setImageUrls(final String... imageUrls) {
        if (imageUrls == null) {
            throw new NullValueException("imageUrls is null");
        }
        final StringBuilder sb = new StringBuilder();
        for (int i = 0; i < imageUrls.length; i++) {
            sb.append("url(\"").append(imageUrls[i]).append("\")");
            if (i < imageUrls.length - 1) {
                sb.append(", ");
            } else {
                sb.append(' ');
            }
        }
        setCssValue(StringBuilderUtil.getTrimmedString(sb));
        this.imageUrls = imageUrls;
    }
sample code :-
{@code backgroundImage.setImageUrls("Test.gif", "TestImage.png")} creates
<code>background-image: url("Test.gif"), url("TestImage.png");</code>.
For css3 syntax method please use
{@code setImageUrls(UrlCss3Value... urlCss3Values)} method.

@param imageUrls
an array of backgroundImage urls, eg:-
{@code backgroundImage.setImageUrls("Test.gif", "TestImage.png")}
and the generated css will be
<code>background-image: url("Test.gif"), url("TestImage.png");</code>
@since 1.0.0
@author WFF