Image link not displayed

Hello there,
I'm developping a webapp like the WebAppExample available on Eclipse's web site and I'm facing an annoying issue with several image links on a report. In fact, I have a report displaying 3 images with links that allow navigation between other reports (32*32 jpegs).

I'm using a RunAndRenderTask to export the report in PDF and there's no problem with these images, they're displaying well and the links are functionnals.
For a HTML display of this report, i'm using two tasks, a RunTask to generate a rptDocument which I extract the TOC and a RenderTask to get the HTML code from this generated rptdocument. With this method, the 3 images are indeed in the HTML but they are'nt displayed.

<td>
<div style="width:0;">
<a target="_blank" href="url">
<img id="AUTOGENBOOKMARK_5_52596549-1c76-448a-8337-8ff290e4933d" style=" width: 32px;display: block;" alt="" src="/birt-viewer/getImage.do?__imageId=filee3d9d013d8d4a20e46.png">
</a>
</div>
</td>

When I check the code with Firebug, the image is available and displayable but the div (with width:0;) is hidden. My render code is very simple and I don't know what I'm missing or doing wrong.

try {
    //Open document
    final IReportDocument document = this.birtEngine.openReportDocument(documentPath, null);
    //Creating the task
    renderTask = this.birtEngine.createRenderTask(document);
 
    //Setting the locale and Timezone
    renderTask.setLocale(locale);
    renderTask.setTimeZone(tz);
 
    //Creating the HTMLRenderOption
    HTMLRenderOption renderOption = new HTMLRenderOption();
    renderOption.setOutputFormat("html");
    renderOption.setEmbeddable(true);
    renderOption.setImageDirectory(imageDirectory);
    renderOption.setBaseImageURL(baseImageUrl);
    renderOption.setImageHandler(new HTMLServerImageHandler());
 
    renderOption.setOutputStream(outputStream);
 
    //Setting the renderOption
    renderTask.setRenderOption(renderOption);
 
    //Execute the task
    renderTask.render();
 
} catch (Exception e) 
{
    //throw Exception
}

If anybody have an idea, please help me (yeah it sounds a little depressed but the issue drives me crazy )
Thank you in advance for any answers you could do.

MattU