Danger of Image-Borne Viruses Looms Hackers are close to finding a way to spread harmful computer viruses just by getting people to open an e-mail message or visiting an infected Web site, computer security experts warned yesterday. &lt;FONT face="verdana,MS Sans Serif,arial,helvetica" size="-2"\ color="#666666"&gt;&lt;B&gt;-washingtonpost.com&lt;/B&gt;&lt;/FONT&gt;