test css prop (with prefixes)

testProp.js

function testProp(prop) {
    var prefixes = ['Webkit', 'Moz', 'O', 'ms'],
        block = document.createElement('div');

    if (block.style[prop] !== undefined) return true;

    prop = prop.charAt(0).toUpperCase() + prop.slice(1);
    for (var i in prefixes) {
        if (block.style[prefixes[i]+prop] !== undefined) return true;
    }

    return false;
}