Question : parse url in JavaScript

I have this in my page:

pageURL = window.location + window.location.hash;

the URL ends up looking like this:
http://www.somewhere.com/4142_234#89773_367

how can I extract the last 4 parts of the URL, so it would be like this:
idOne='4142';
idTwo='234';
idThree='89773';
idFour='367';

we're splitting at the # and then splitting each one at the _

Answer : parse url in JavaScript

this javascript will get you all four in one array
var myArray = str.split(/#|_/g);

and this will give that last string
var str="http://www.somewhere.com/4142_234#89773_367";
document.write( str.substring( str.lastIndexOf("/") + 1));