I've created a custom page for my advanced search using
<SEARCHWC:AdvancedSearchBox webpart="true" runat="server" __WebPartId="{FDC8E1FF-48ED-4754-84A2-E81BDEE4B4E1}" id="AdvancedSearchBox1">
<WebPart xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="http://schemas.microsoft.com/WebPart/v2">
..........
and have used
<SearchWC:CoreResultsWebPart runat="server" FrameType="None" />
on my results page. Does anyone know how I can pass XSLT to CoreResultsWebPart so that I can format the results?