How do I use javascript/jquery to change the text on a button in Twitter Bootstrap without destroying the icon?

So, this is my static markup:

<a class=btn id=myButton onclick=doSomething()><i class=icon-ok></i> Do it...</a>

I am able to change the icon, like this:

$('#myButton i:first-child').attr('class','icon icon-remove');

Which is fine, but for the love of all that is good I cannot find a way to set the button text without then wiping out the icon. Eg. if I do this:

$('#myButton').text('Some Remove Text');

I lose the icon element, so how can I access just the text and edit that, whilst preserving any child elements?