target.innerHTML = source.innerHTML;

That's exactly what we do in the filters tool. We prepare the source for all filters, and then copy their innerHTML to the user's visible area. Let's take a simple filter first and see how we prepare its control in advance. The Engrave filter is the simplest filter as it does not accept any parameters. (it suppose to support the bias parameter but it does not seem to influence the filter at all in Internet Explorer 5.5.) Here is the control for the Engrave filter:

<SPAN id=oEngraveControlsstyle="DISPLAY: none">
</SPAN>

Notice how we hide this control by specifying "DISPLAY: none" for the STYLE parameter.

Look for usage of this technique in Column 69, The Filters Demo Tool.

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