[](http://www.uploadify.com) # expressInstall Input Type:**string** Input Format:**/path/to/expressInstall.swf** Default:**null** Required:**optional** The **expressInstall** option points to the flash expressInstall.swf file that is used by the system to install flash if it does not exist. ### Demo Javascript Code 1. $('#file_upload').uploadify({ 1.   'uploader'       : '/uploadify/uploadify.swf', 1.   'script'         : '/uploadify/uploadify.php', 1.   'cancelImg'      : '/uploadify/cancel.png', 1.   'folder'         : '/uploads', 1.   'expressInstall' : '/uploadify/expressInstall.swf' 1. }); HTML Code 1. <inputtype="file"id="file_upload"name="file_upload"/> 1. <ahref="javascript:$('#file_upload').uploadifyUpload();">Upload Files</a> [Upload Files](#) [](#) Help keep Uploadify free and support the development of other excellent apps!  [home](#)  |  [about](#)  |  [download](#)  |  [demos](#)  |  [documentation](#)  |  [faqs](#)  |  [forums](#) ©2011 by [Reactive Apps](http://www.reactiveapps.com)