Javascript in a website -

This is a basic question but Google did not help.

I have a website and what to do to run javascript on it.

In my directory I have index.html, and index.css. For the javascript file, I am assuming that it should be called index.js.

I have this in my index.js file:

  var countTime = 0; // Number of seconds var redirectURL = "http://example.com"; // countTime = (countTime + 1) * URL for direct to 1000; Function UpdateCount () {countTime = countTime-1000; If (document.getElementById ("Countdown Performance")) document.getElementById ("Countdown Performance"). InnerHTML = (countTime / 1000); If (countTime & lt; = 0) location.href = redirectURL; Else setTimeout ("updateCount ()", 1000); } UpdateCount ();   
 However, when I go from page to browser, it does not work. Do I have to do something in my HTML file like index.js or something?   
 
 
  & lt; Script src = "index.js" type = "text / javascript" & gt; & Lt; / Script & gt;   
 Your  & lt; Head & gt; .  
 This will load the script for you and then the code will be executed.  
 Yours too  
  & lt; Div id = "countdownDisplay" & gt; & Lt; / Div & gt; In your  & lt;   & lt; Style src = "index.css"  
          / P>