varible in url question

on my page (lessen.php) i have a variable $sort if this varible is empty if enterd the page then it will be set on 'day' i have 3 links in the page lessen.php?sort=day lessen.php?sort=game lessen.php?sort=player so these links refure to the same page (itself) on clicked it opens itself and should set the varible to day, game or player but that doesn't happen. can somebody help me please see attachmend greetz @cid begin 666 lessen.php M/#]P:' -"@T*:68H(21S;W)T*7L-"B1S;W)T(#T@(F1A>2([#0I]#0H-"F5C M:&\H(G-O<G0Z(B N("1S;W)T*3L-"C\^#0H-"CQ(5$U,/@T*/$A%040^#0H) M/%1)5$Q%/CPO5$E43$4^#0H-"@T*/"](14%$/@T*/$)/1%D^#0H\<"!A;&EG M;CTB<FEG:'0B(#XN3$534T5.4D]/4U1%4CPO<#X-"CQT86)L92!W:61T:#TB M,3 P)2(@8F]R9&5R/2(P(B!C96QL<W!A8VEN9STB,2(@/@T*(" \='(@/B - M"B @(" \=&0@=VED=&@](C$W)2(^/&$@:')E9CTB;&5S<V5N+G!H<#]S;W)T M/61A>2(@=&%R9V5T/2)?<V5L9B(^9&%Y/"]A/CPO=&0^#0H@(" @/'1D('=I M9'1H/2(Q.24B/DAO=7(\+W1D/@T*"3QT9"!W:61T:#TB,S$E(CX\82!H<F5F M/2)L97-S96XN<&AP/W-O<G0]9V%M92(@=&%R9V5T/2)?<V5L9B(^9V%M93PO M83X\+W1D/@T*"3QT9"!W:61T:#TB,S,E(CX\82!H<F5F/2)L97-S96XN<&AP M/W-O<G0]<&QA>65R(B!T87)G970](E]S96QF(CYP;&%Y97(\+V$^/"]T9#X- J"CPO='(^#0H-"CPO=&%B;&4^#0H-"@T*#0H\+T)/1%D^#0H\+TA434P^ ` end