if ( !document.radioOff) {
   document.radioOff = new Image();
   document.radioOff.src="../images/radio-0.gif";
   document.radioOn = new Image();
   document.radioOn.src="../images/radio-1.gif";
}

if ( !document.checkOn) {
   document.checkOn = new Image();
   document.checkOn.src="../images/check-1.gif";
   document.checkOff = new Image();
   document.checkOff.src="../images/check-0.gif";
}

if ( !document.naOn) {
   document.naOn = new Image();
   document.naOn.src="../images/na-1-nonum.gif";
   document.naOff = new Image();
   document.naOff.src="../images/na-0-nonum.gif";
}

if ( !document.rsimg) {
   document.rsimg = new Array();
   
   for(var i=1; i<=10; i++)
   {
      document.rsimg[2*i] = new Image();
      document.rsimg[2*i+1] = new Image();
      document.rsimg[2*i].src   = "../images/" + i + "-0.gif";
      document.rsimg[2*i+1].src = "../images/" + i + "-1.gif";
   }
}