function MnOpenWin( windowURL ) {
   var winleft = (screen.width - 790) / 2;
   var winUp = (screen.height - 500) / 2;
   MyWin =  window.open( 'http://www.marktnet.nl/ad.asp?Id=' + windowURL, 'MnAd', 'width=790,height=500,left=' + winleft + ',top=' + winUp + ',toolbar=1,location=1,directories=0,status=0,menuBar=1,scrollBars=1,resizable=1' ) ;
   if (parseInt(navigator.appVersion) >= 4) { MyWin.focus(); }
   }
   
function MnNewAd() {
   var winleft = (screen.width - 790) / 2;
   var winUp = (screen.height - 500) / 2;
   MyWin =  window.open( 'http://www.marktnet.nl/insertad.asp', 'MnAd', 'width=790,height=500,left=' + winleft + ',top=' + winUp + ',toolbar=1,location=1,directories=0,status=0,menuBar=1,scrollBars=1,resizable=1' ) ;
   if (parseInt(navigator.appVersion) >= 4) { MyWin.focus() }
   }



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