Putting icon instead of “ + ” or “ - ” in an accordian menu.js file

Question

I am making an accordian menu.
I just found this link http://jsfiddle.net/zM5Vj/ , and it is almost similar to the accordian menu I have made.
In the code, where there i

Answer 1

Thank You All for responding and helping me in solving it.
@Simon Adcock, Your answer gave me a new way to think about the solution.
However, i also found a 1 line solution to it.
I just added this line to my .js file

 $(this).append($(''))

So, answer finally it is :

if (x == "block") {
        $(this).text('');
        $(this).append($(''))
        $(this).append(' ' + valueText);
    }
    else {
        $(this).text('');
        $(this).append($(''))
        $(this).append(' ' + valueText);
    }