HTML code for automatic history.back reload

Is there an HTML code that can make my error 404 page to automatically reload "back to previous page"?

Just put the JavaScript in your 404 page, like this: (of course, this assumes that you have access to your server's error page configuration)

This article explains how to make a custom 404 page, and just put casablanca's code in it

Yes, I have accsess to customizing error pages.
Casablanka's code is pretty neat, but there is one thing I wanted to ask, is there and what exactly is the setting for how many seconds it stays on before preloading?

Thanks guys, I'll see what I can do but maybe I should stick to the regular history.back button thingy.

You mean it should wait for a few seconds before going back? This should do that:

Okay, thanks.
But.. I think I have a very serious problem right now. I accidentally replaced the original .htaccess file with an experimental one and.. well, can someone please tell me what was supposedly contained in the original one so I can make it again and upload it? What was the original code in the original .htaccess file >_____<

.htaccess files can contain just about anything - you really can't say until some part of your website breaks down. If you haven't changed the file previously, it's probably the default - you might find a copy in another directory or you can ask your web host.

Yes, so I did. It turns out that.. it's.. BLANK!
And I realized that my mistake was that I was editing it with Notepad supposedly clearing all the text in it in my PC and then uploading it but my site still didn't fix - but when I opened it with the file manager editor, it turned out there were two squares(?) in it. After I deleted them, everything went to normal.

It's supposed to be an Apache server but it acts weird. When I did the ErrorDocument 404 /404.html in notepad and uploaded it, it didn't work. But when I edited it with the file manager editor, now it all works well.

those two squares were probably spaces ( \n\n ) or tabs ( \r\r ) or some other special case characters.

\r isn't a tab..

HKt0p5, the funky characters you saw were probably just line endings that Notepad isn't used to. I hate using Notepad for just about anything because it never knows how to properly display files with UNIX or Mac line endings.

\t is a tab correct?

Yes, \t is a tab and \r is a carriage return.

But what I don't understand is why copying from Windows to Unix causes a problem. Usually, the reverse causes a problem because Unix uses only \n whereas Notepad expects \r\n.

It wasn't the copying that caused the problem, it was Notepad.

It's Notepad that can't open files saved on Unix. But files saved using Notepad should be openable elsewhere right?