JSFiddle - React, Tailwind, and code Playground

HTML

<embed class="flash "id="flash" src="swf/pano.swf?panoSrc=images/a.jpg" 
                     allowFullScreen="true" 
                     width="1280" height="640" quality="high" 
                     pluginspage="http://www.macromedia.com/go/getflashplayer" 
                     type="application/x-shockwave-flash" bgcolor="#DDDDDD"/>

JavaScript

function change() 
{
   document.getElementById("flash").setAttribute('src', 'swf/pano.swf?panoSrc=b.jpg');
}

change();


alert(document.getElementById('flash').src);