"Make this page your Startpage" script (JavaScript)

I have Googled for a JavaScript that sets the current page to your startpage. But all I can find is some old script for IE 5 and up.

<FORM>
<INPUT TYPE="button" VALUE="Make This Site Your Home Page" onClick="this.style.behavior=开发者_如何学运维'url(#default#homepage)'; this.setHomePage('Page URL beginning with http:// here');">
</FORM>

They only seem to work in IE and they also seem to be inline.

I'd like one in my script file and one that works in all browsers.

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Id like one in my script file

That shouldn't be a problem. Add

document.getElementById("link_id").style.behavior = .......

to your script file (also giving the link an ID).

and one that works in all browsers.

That is not possible. (Thankfully, in my opinion.) I think there was a workaround for Firefox, but none for the other browsers.

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The answers given in this duplicate post cover it best:

How can I set default homepage in FF and Chrome via javascript?

In essence: Just don't.

If you feel you have to: provide instructions, enable users to do it manually.