Using Javascript to Alternate background color of HTML element -

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so have practise test asks me change background color , text color of paragraph section id "fourth" black background , white text vise versa , reverse every 30 seconds preferably using if/else statements. reason if statement (and else statement) not work.

the code have far this:

html

<html> <head> <link href="teststyle.css" rel="stylesheet" type="text/css"/> <script src="flash.js" type="text/javascript"></script> </head> <body> <div id="first"> mares eat oats </div> <h1 id="second"> , eat oats </h1> <p id="third"> , little lambs eat ivy </p> <p id="fourth">   mirthipan karunakaran </p> </body> </html>

css

#first {  text-align: center; }  #second {   color: green;   text-align: left; }  #third {   color: orange;   text-align: right; }  #fourth {   color: white;   background-color: black; }

javascript

function updatepage(){  var name = document.getelementbyid("fourth");  if(name.style.backgroundcolor == "black") {  name.style.backgroundcolor = "pink";    } else {   name.style.backgroundcolor = "purple"; }  }  function startupdate(){   updatepage();   window.setinterval(updatepage,10 * 1000); }  window.onload=startupdate;

how go making work?

the problem if statement. never black background color.

see working jsfiddle demo

and should working updatepage function: 

function updatepage() {      var name = document.getelementbyid("fourth");      if (name.style.backgroundcolor == "black") {         name.style.backgroundcolor = "pink";         name.style.color = "black";     } else {         name.style.backgroundcolor = "black";         name.style.color = "pink";     } }

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