How might I get the script filename from within that script?

I'm aware this is old but I have developed a better solution because all of the above didn't work for Async scripts. With some tweaking the following script can cover almost all use cases. Heres what worked for me:

function getScriptName() {
    var error = new Error()
      , source
      , lastStackFrameRegex = new RegExp(/.+\/(.*?):\d+(:\d+)*$/)
      , currentStackFrameRegex = new RegExp(/getScriptName \(.+\/(.*):\d+:\d+\)/);

    if((source = lastStackFrameRegex.exec(error.stack.trim())) && source[1] != "")
        return source[1];
    else if((source = currentStackFrameRegex.exec(error.stack.trim())))
        return source[1];
    else if(error.fileName != undefined)
        return error.fileName;
}

Not sure about support on Internet Explorer, but works fine in every other browser I tested on.

var scripts = document.getElementsByTagName('script');
var lastScript = scripts[scripts.length-1];
var scriptName = lastScript.src;
alert("loading: " + scriptName);

Tested in: FF 3.0.8, Chrome 1.0.154.53, IE6

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See also: How may I reference the script tag that loaded the currently-executing script?