New image every hour

Ok so i know how to make a script for a new image every day of the week, but how about every hour?

There are many codes out there, but if you want to edit an existing code.

<script language=javascript>
/*
Changing image or text each day(sunday to saturday)
Author: Narayan Chand Thakur
Source: http://ncthakur.itgo.com/
This may be used freely as long as this message is intact.
*/
<!--hide

nctday=new Date();
day=nctday.getDay();

var numberofimages = 7;
images = new Array(numberofimages+1);
images[0] = "<img src='yourimage.jpg'>";
images[1] = "<img src='yourimage02.jpg'>";
images[2] = "<img src='yourimage03.jpg'>";
images[3] = "<img src='yourimage04.jpg'>";
images[4] = "<img src='yourimage05.jpg'>";
images[5] = "<img src='yourimage06.jpg'>";
images[6] = "<img src='yourimage07.jpg'>";

document.write(images[day]);
//-->
</script>

Code (markup):

Here is one.

Payment, 2 weeks Sidebar backlink on PR2 website

 

without testing...

<script language=javascript>

var nctday=new Date();
var hour=nctday.getHours();

images = new Array();
images[0] = "<img src='yourimage.jpg'>";
images[1] = "<img src='yourimage02.jpg'>";
images[2] = "<img src='yourimage03.jpg'>";
images[3] = "<img src='yourimage04.jpg'>";
images[4] = "<img src='yourimage05.jpg'>";
images[5] = "<img src='yourimage06.jpg'>";
images[6] = "<img src='yourimage07.jpg'>";
images[7] = "<img src='yourimage08.jpg'>";
images[8] = "<img src='yourimage09.jpg'>";
images[9] = "<img src='yourimage10.jpg'>";
images[10] = "<img src='yourimage11.jpg'>";
images[11] = "<img src='yourimage12.jpg'>";
images[12] = "<img src='yourimage13.jpg'>";
images[13] = "<img src='yourimage14.jpg'>";
images[14] = "<img src='yourimage15.jpg'>";
images[15] = "<img src='yourimage16.jpg'>";
images[16] = "<img src='yourimage17.jpg'>";
images[17] = "<img src='yourimage18.jpg'>";
images[18] = "<img src='yourimage19.jpg'>";
images[19] = "<img src='yourimage20.jpg'>";
images[20] = "<img src='yourimage21.jpg'>";
images[21] = "<img src='yourimage22.jpg'>";
images[22] = "<img src='yourimage23.jpg'>";
images[23] = "<img src='yourimage24.jpg'>";

document.write(images[hour]);
</script>

Code (markup):

 

Weird, i used something just like this before and it didn't work.

Works correctly!
I tested this 3 minutes before it turned a new hour, then waited. The number changed from 20 to 21.

I still can't figure out what was wrong with my code.
Thank you
Voted best answer.