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Here is simple jquery function to know about the IE browser version. jQuery(document).ready(function(){    var browserProperties = $.browser;      if ($.browser.msie) {        if(browserProperties.version < "9"){            alert("Please upgrade your Internet Explorer to verion 9 and above.");                  }    }    });

If you have a YouTube video embedded within your web page that ignores the z-index of fixed or absolutely positioned DIV elements then here is both the html and the JavaScript (jquery) fix. Instead of embedding the youtube iframe like this <iframe title="YouTube video player" width="480" height="390" src="http://www.youtube.com/embed/lzQgAR_J1PI" frameborder="0" wmode="Opaque"> add ?wmode=transparent to the embedded link like this: Add wmode to fix youtube iframe zindex <iframe title="YouTube video player" width="480" height="390" src="http://www.youtube.com/embed/lzQgAR_J1PI?wmode=transparent" frameborder="0" wmode="Opaque"> Or, add the following Jquery javascript youtube iframe z-index fix: Add wmode to fix youtube iframe zindex $(document).ready(function(){     $('iframe').each(function(){           var url = $(this).attr(...