static string transformEPNRSSUrl(string inputUrl)
{
    string transformed = "http://rest.ebay.com/epn/v1/find/item.rss?";

    //split url by ?
    string[] splitUrl = inputUrl.Split(new char[] { '?' });

    //split second by &
    string[] splitParams = splitUrl[1].Split(new char[] { '&' });

    //new params
    string newParams = "";

    //transform params
    foreach (string s in splitParams)
    {
        string retID = "";
        string retVal = "";
        string[] sV = s.Split(new char[] { '=' });

        //mostly :p
        retVal = sV[1];

        //see if tis required
        if (sV[0] == "sacat") { retID = "categoryId1"; }
        if (sV[0] == "satitle") { retID = "keyword"; }
        if (sV[0] == "afepn") { retID = "campaignid"; }
        if (sV[0] == "customid") { retID = "customid"; }
        if (sV[0] == "saprclo") { retID = "minPrice"; }
        if (sV[0] == "saprchi") { retID = "maxPrice"; }
	
        if (retID != "")
        {
            if (newParams != "") { newParams += "&"; } //for all but first
            newParams += retID + "=" + retVal;
        }

        //last few additions 24/06/2011
        if (sV[0] == "fts" && sV[1] == "2") { newParams += "descriptionSearch=true"; }
        if (sV[0] == "sascs" && sV[1] == "2") { newParams += "listingType1=AuctionWithBIN&listingType2=FixedPrice"; }

    }

    transformed += newParams;
    //following is some defaults for me, check these yourself, use:
    //http://woodylabs.com/scripts/ebay-epn-rss-url-converter.php
    transformed += "&sortOrder=EndTimeSoonest&programid=15&toolid=10039&listingType1=All&lgeo=1&feedType=rss";

    return transformed;
}