if(document.images){  
   var fz1Off=new Image();
   fz1Off.src="images/fz1icon.gif";
   var fz1On=new Image();
   fz1On.src="images/fz1iconhighlight.gif";
   var ct2kOff=new Image();
   ct2kOff.src="images/ct2000icon.gif";
   var ct2kOn=new Image();
   ct2kOn.src="images/ct2000iconhighlight.gif";
   var jbOff=new Image();
   jbOff.src="images/jballisticsicon.gif";
   var jbOn=new Image();
   jbOn.src="images/jballisticsiconhighlight.gif";
   var fp2Off=new Image();
   fp2Off.src="images/flightplannericon.gif";
   var fp2On=new Image();
   fp2On.src="images/flightplannericonhighlight.gif";
   var fm2Off=new Image();
   fm2Off.src="images/financemastericon.gif";
   var fm2On=new Image();
   fm2On.src="images/financemastericonhighlight.gif";
   var uplOff=new Image();
   uplOff.src="images/uploadericon.gif";
   var uplOn=new Image();
   uplOn.src="images/uploadericonhighlight.gif";
   var scOff=new Image();
   scOff.src="images/spellcheckericon.gif";
   var scOn=new Image();
   scOn.src="images/spellcheckericonhighlight.gif";
   var ctOff=new Image();
   ctOff.src="images/ctbutton.gif";
   var ctOn=new Image();
   ctOn.src="images/ctbutton2.gif";
   var pmOff=new Image();
   pmOff.src="images/pmbutton.gif";
   var pmOn=new Image();
   pmOn.src="images/pmbutton2.gif";
   var fmOff=new Image();
   fmOff.src="images/fmbutton.gif";
   var fmOn=new Image();
   fmOn.src="images/fmbutton2.gif";
   var fpOff=new Image();
   fpOff.src="images/fpbutton.gif";
   var fpOn=new Image();
   fpOn.src="images/fpbutton2.gif";
}
function off(linkID){
   document[linkID].src=eval(linkID+"Off.src");
}
function on(linkID) {
   document[linkID].src=eval(linkID+"On.src");
}