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Created attachment 1350 [details] the source of my web page Well, here are three errors that I get from the validator on my page, http://clrhome.org/blastav: 1. Line 1, Column 1: no document type declaration; implying "<!DOCTYPE HTML SYSTEM>" 2. Line 1, Column 138: end tag for "HEAD" which is not finished 3. Line 1, Column 145: end tag for "HTML" which is not finished Now, for the four warnings: 1. Unable to Determine Parse Mode! 2. No DOCTYPE found! Checking with default HTML 4.01 Transitional Document Type. 3. No Character encoding declared at document level 4. No Character Encoding Found! Falling back to UTF-8. As you can see in the file I have enclosed, 1. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 2. <html xmlns="http://www.w3.org/1999/xhtml"> 3. <meta http-equiv="content-type" content="text/xhtml+xml; charset=UTF-8" /> 4. both <head> and <html> are quite closed. ** The last time I validated this page using your system, it told me it was well formed. Now all of a sudden, it has errors, when I changed nothing.