bold, header effects in alert()?

in javascript, how to make alert bold n use h1 to h5 headers? Is this possible or simply p开发者_StackOverflow中文版lain alert is option?

how to include bold and h1 to this alert?

function onlooad()
{
    alert("wssup??");

}

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You can not use HTML in alert(). For that you need to use window.open() or some custom code like this:
http://docs.jquery.com/UI/Dialog

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As far as I know, this is impossible.

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You can use custom elements that act like alert boxes. Check this one out

jQuery Impromptu

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Javascript alert is limited in terms of formatting because it does not recognise HTML markup. If this is important, consider an in-page alternative. A quick web search turned up the following:

http://www.jondavis.net/codeprojects/jqalert/

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Sorry, but in JavaScript, you can only use plaintext alerts. Now, you can use \n for a newline, by the way, but the alert() function only allows plaintext. Again, sorry.