var FrameManager =
{
    currentFrameId : '',
    currentFrameHeight : 0,
    lastFrameId : '',
    lastFrameHeight : 0,
    resizeTimerId : null,
    init : function()
    {
        if (FrameManager.resizeTimerId == null)
        {
            FrameManager.resizeTimerId = window.setInterval(FrameManager.resizeFrames, 500);
        }
    },
    resizeFrames : function()
    {
        FrameManager.retrieveFrameIdAndHeight();
        if ((FrameManager.currentFrameId != FrameManager.lastFrameId) ||
            (FrameManager.currentFrameHeight != FrameManager.lastFrameHeight))
        {
            var iframe = document.getElementById(FrameManager.currentFrameId.toString());
            if (iframe == null)
                return;
            iframe.style.height = FrameManager.currentFrameHeight.toString() + "px";
            FrameManager.lastFrameId = FrameManager.currentFrameId;
            FrameManager.lastFrameHeight = FrameManager.currentFrameHeight;
            window.location.hash = '#';
        }
    },
    retrieveFrameIdAndHeight : function()
    {
        if (window.location.hash.length == 0)
            return;
        var hashValue = window.location.hash.substring(1);
        if ((hashValue == null) || (hashValue.length == 0))
            return;
        var pairs = hashValue.split('&');
        if ((pairs != null) && (pairs.length > 0))
        {
            for(var i = 0; i < pairs.length; i++)
            {
                var pair = pairs[i].split('=');
                if ((pair != null) && (pair.length > 0))
                {
                    if (pair[0] == 'frameId')
                    {
                        if ((pair[1] != null) && (pair[1].length > 0))
                        {
                            FrameManager.currentFrameId = pair[1];
                        }
                    }
                    else if (pair[0] == 'height')
                    {
                        var height = parseInt(pair[1]);
                        if (!isNaN(height))
                        {
                            FrameManager.currentFrameHeight = height;
                            FrameManager.currentFrameHeight += 15;
                        }
                    }
                }
            }
        }
    },
    registerFrame : function(frame)
    {
        var currentLocation = location.href;
        var hashIndex = currentLocation.indexOf('#');
        if (hashIndex > -1)
        {
            currentLocation = currentLocation.substring(0, hashIndex);
        }
        var paramSpacer = frame.src.indexOf('?') == -1 ? '?' : '&';
        frame.contentWindow.location = frame.src + paramSpacer + 'frameId=' + frame.id + '#' + currentLocation;
    }
};

window.setTimeout(FrameManager.init, 300);