Note for JavaScript rollovers:
When images and their path ('src') are pre-defined in script,
— e.g., <script> sig1=new Image(); sig1.src="sigOut.jpg"; sig2=new Image(); sig2.src="sigOver.gif"; </script> —
reference to image “proxies” thus pre-defined are not 'quoted' as string literals in link:
<a href="#nogo" onClick="document.images['sig'].src=sig2.src"> <img src="sigOut.jpg" name="sig" alt="rollover image" > </a>

But, when images and their src/path are NOT pre-defined in a <script> for pre-loading,
the direct reference to their name and path need to be 'quoted' as string literals:
<a href="#nogo" onMouseOver="document.images['holder'].src='IL143.jpg'" onClick="document.images['holder'].src='IL143.gif'">IL143</a>

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