if (document.images){
     sub1off= new Image(62,16);
     sub1off.src="/system/modules/au.edu.unsw.cse.new/resources/submenu/courses/timetables-0.gif";
     sub1on= new Image(62,16); 
     sub1on.src="/system/modules/au.edu.unsw.cse.new/resources/submenu/courses/timetables-1.gif"; 
     
     sub2off= new Image(66,16);
     sub2off.src="/system/modules/au.edu.unsw.cse.new/resources/submenu/courses/csecourses-0.gif";
     sub2on= new Image(66,16); 
     sub2on.src="/system/modules/au.edu.unsw.cse.new/resources/submenu/courses/csecourses-1.gif";
     
     sub3off= new Image(106,16);
     sub3off.src="/system/modules/au.edu.unsw.cse.new/resources/submenu/courses/searchcsecourses-0.gif";
     sub3on= new Image(106,16); 
     sub3on.src="/system/modules/au.edu.unsw.cse.new/resources/submenu/courses/searchcsecourses-1.gif";
     
     UNSWonlinehandbookBoff= new Image(173,16);
	 UNSWonlinehandbookBoff.src="/system/modules/au.edu.unsw.cse.new/resources/submenu/courses/UNSWonlinehandbook-0.gif";
	 UNSWonlinehandbookBon= new Image(173,16) 
	 UNSWonlinehandbookBon.src="/system/modules/au.edu.unsw.cse.new/resources/submenu/courses/UNSWonlinehandbook-1.gif";

}

function submenuTurnOn(imgName){
   if (document.images){
      imgOn=eval(imgName + "on.src");
      document[imgName].src= imgOn;
   }
 }

function submenuTurnOff(imgName){
   if (document.images){
      imgOff=eval(imgName + "off.src");
      document[imgName].src= imgOff;
   }
}