var _imgCache = [];

function _preload(inUrls)
{
    if (document.images)
    {
        var pLen = inUrls.length;
        for ( var i = 0; i < pLen; i++)
        {
            var pImage = new Image();
            pImage.src = inUrls[i];
            _imgCache.push(pImage);
        }
    }
}
function _flip(inObject, inUrl)
{
    var pEl = document.getElementById(inObject);
    pEl.src = inUrl;
}