normal_nck = new Image();
normal_nck.src = "/TXD/Deltares/images/Nck_logo.png";
normal_ncr = new Image();
normal_ncr.src = "/TXD/Deltares/images/Ncr_logo.png";
normal_igrac = new Image();
normal_igrac.src = "/TXD/Deltares/images/logo IGRAC.png";

mouseover_nck = new Image();
mouseover_nck.src = "/TXD/Deltares/images/Nck_logo over.png";
mouseover_ncr = new Image();
mouseover_ncr.src = "/TXD/Deltares/images/Ncr_logo over.png";
mouseover_igrac = new Image();
mouseover_igrac.src = "/TXD/Deltares/images/logo IGRAC over.png";

function swap(){
   if (document.images){
      for (var x=0;
      x<swap.arguments.length;
      x+=2) {
         document[swap.arguments[x]].src = eval(swap.arguments[x+1] + ".src");
      }
   }
}