Shrink text until it fits

subway.js

// It's using Mootools to get/set the font-size. You shouldn't
// really need that, I'll change it later.

function shrink() {
    var wrapper = $('wrapper'),
        text = $('text'),
        minimumFontSize = 11,
        fontSize;
 
    while(text.offsetWidth > wrapper.offsetWidth) {
        fontSize = parseInt(text.getStyle('font-size'), 10);
        if(fontSize > minimumFontSize)
            text.setStyle('font-size', --fontSize);
        else break;
    }
}

window.addEvent('resize', shrink);

http://jsfiddle.net/IgnacioIglesias/vC4GD/7/