/**
 * Previews the css by gathering all values from the submitted form
 * and setting them as the class attributes on the preview DIV.
 */
function previewCSS(form) {
    var previewClasses = "";
    for (var i = 0; i < form.elements.length; i++) {
        var field = form.elements[i];
        if (field.type == "radio" && 
            field.checked &&
            field.value.length > 0) {
            if (previewClasses.length > 0) {
                previewClasses += " ";
            }
            previewClasses += field.value;
        }
    }
    window.frames[0].document.getElementById("previewBody").className = previewClasses;
}