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Getting modules to validate with the W3C validator can often involve hacking templates and/or php files. If you track down a pesky un-quoted value, be sure to use the same quoting method used in the rest of the statement, or you can run into problems - including a blank page.
For example, if the statement reads:
<img src='%s' border=0 alt='%s'>
be sure to correct it as:
<img src='%s' border='0' alt='%s'>
and NOT
<img src='%s' border="0" alt='%s'>
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