Two ways: 1) The individual links should be calling and loading the destination content using XmlHttp (AJAX) and filling the content DIV. 2) URL Cloaking (http://www.bullet-proof-webhosting.com/url-cloaking.htm[^])
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Tech Gossips
The woods are lovely, dark and deep, But I have promises to keep, And miles to go before I sleep, And miles to go before I sleep!