Access value of HTML title attribute as variable in onclick function

Access value of HTML title attribute as variable in onclick function

I want to access the value of the HTML title attribute as a variable for
the onclick function.
This is an example for my HTML elements:
<a title="id:4" onclick="openWin(4)">example</a>
This is my JavaScript function:
function openWin(number)
{
window.open("http://www.some-example.org/some/example/id:"+number)
}
This works but since I have a lot of HTML elements, I'd like to find a way
to reference the title value inside the openWin() function instead of
writing "openWin(someNumber)". Do you have any ideas how to do this?
Any help would be much appreciated!