Change single quotes to double quotes

walk(document.body);
function walk(node)
{
    // I stole this function from here:
    // http://is.gd/mwZp7E

    var child, next;

    switch ( node.nodeType )
    {
        case 1:  // Element
        case 9:  // Document
        case 11: // Document fragment
            child = node.firstChild;
            while ( child )
            {
                next = child.nextSibling;
                walk(child);
                child = next;
            }
            break;

        case 3: // Text node
            handleText(node);
            break;
    }
}

function handleText(textNode)
{
    var v = textNode.nodeValue;
    v = v.replace(/( ')/g, ' "');
    v = v.replace(/(')(?![a-z])/g, '"');

    textNode.nodeValue = v;
}