function clearValue(textBox) {
    if (textBox.value == textBox.defaultValue)
        textBox.value = "";
}

function resetValue(textBox) {
    if (textBox.value == "")
        textBox.value = textBox.defaultValue;
}

(function($) {
    var cache = [];
    $.preLoadImages = function() {
        var args_len = arguments.length;
        for (var i = args_len; i--;) {
            var cacheImage = document.createElement('img');
            cacheImage.src = arguments[i];
            cache.push(cacheImage);
        }
    }
}) (jQuery)