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copied!<p>The Silverlight control only has an <a href="http://msdn.microsoft.com/en-us/library/system.windows.interop.silverlighthost.isversionsupported(VS.95).aspx" rel="nofollow noreferrer">IsVersionSupported function</a>, which returns true / false when you give it a version number, e.g.:</p> <pre><code>if(slPlugin.isVersionSupported("2.0")) { alert("I haz some flavour of Silverlight 2"); </code></pre> <p>You can be as specific as you want when checking the build, since the version string can include all of the following:</p> <ul> <li>major - the major number</li> <li>minor - the minor number</li> <li>build - the build number</li> <li>revision - the revision number</li> </ul> <p>So we can check for a specific build number as follows:</p> <pre><code>if(slPlugin.isVersionSupported("2.0.30523")) { alert("I haz Silverlight 2.0.30523, but could be any revision."); </code></pre> <p><a href="http://msdn.microsoft.com/en-us/library/bb693297.aspx#replace_version" rel="nofollow noreferrer">Silverlight 1.0 Beta included a control.settings.version property, which was replaced with the isVersionSupported() method</a>. The idea is that you shouldn't be programming against specific versions of Silverlight. Rather, you should be checking if the client has <em>at least</em> verion 1.0, or 2.0, etc.</p> <p>That being said, you can get the Silverlight version number in Firefox by checking the Silverlight plugin description:</p> <pre><code>alert(navigator.plugins["Silverlight Plug-In"].description); </code></pre> <p>Shows '2.0.30523.8' on my computer.</p> <p>Note that it is possible to brute force it by iterating through all released version numbers. <a href="http://pages.citebite.com/w3o7qsydtr" rel="nofollow noreferrer">Presumably that's what BrowserHawk does</a> - they'll report which version of Silverlight the client has installed.</p>

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