function highlight(Gr,turnon)
{
        var sUrl=self.top.class_sample.document.URL;
        var sImgs=self.top.class_sample.document.images;
        var sldURL=sUrl.slice(sUrl.length-5,sUrl.length);
        if (sldURL=="s.htm")
        {
                sTurnOn=[];
                if (Gr==1)
                {
                        sTurnOn=["s1","s5","s10","s12"];
                }
                else if (Gr==2)
                {
                        sTurnOn=["s13","s14","s15"];
                }
                else if (Gr==3)
                {
                        sTurnOn=["s28","s19","s30"];
                }
                else if (Gr==4)
                {
                        sTurnOn=["s33","s36"];
                }
                else if (Gr==5)
                {
                        sTurnOn=["s41"];
                }
                else if (Gr==6)
                {
                        sTurnOn=["s44"];
                }
                else if (Gr==7)
                {
                        sTurnOn=["s51"];
                }

                if (sTurnOn.length>0)
                {
                        if (turnon==1)
                        {
                                var sFilter="alpha(opacity=50)";
                        }
                        else
                        {
                                var sFilter="Gray";
                        }
                        for(i=0; i<sTurnOn.length; i++)
                        {
                                if (eval("sImgs."+ sTurnOn[i]))
                                {
                                        eval("sImgs."+ sTurnOn[i]+ ".style.filter=sFilter;");
                                }
                        }
                
                }
        }
}