function mainover(subname) { //main menu state to "on" when rolled over
		document.getElementById(subname).src='images/menu/'+subname+'-on.gif';		//mainmenu on state
}
function mainout(subname) { //main menu state to "off" when rolled out
		document.getElementById(subname).src='images/menu/'+subname+'-off.gif';		//mainmenu off state
}

if (document.images) //preload
{
  pic1= new Image(); 
  pic1.src="images/menu/home-on.gif";
  pic2= new Image(); 
  pic2.src="images/menu/aboutus-on.gif"; 
  pic3= new Image(); 
  pic3.src="images/menu/service-on.gif"; 
  pic4= new Image(); 
  pic4.src="images/menu/process-on.gif";
  pic5= new Image(); 
  pic5.src="images/menu/publications-on.gif";
  pic6= new Image(); 
  pic6.src="images/menu/knowledge-on.gif";
  pic7= new Image(); 
  pic7.src="images/menu/contact-on.gif";
  pic8= new Image(); 
  pic8.src="images/menu/jobs-on.gif";
  pic9= new Image(); 
  pic9.src="images/menu/login-on.gif";
  pic10= new Image(); 
  pic10.src="images/menu/wiki-on.gif";
  pic11= new Image(); 
  pic11.src="images/menu/home-off.gif";
  pic12= new Image(); 
  pic12.src="images/menu/aboutus-off.gif"; 
  pic13= new Image(); 
  pic13.src="images/menu/service-off.gif"; 
  pic14= new Image(); 
  pic14.src="images/menu/process-off.gif";
  pic15= new Image(); 
  pic15.src="images/menu/publications-off.gif";
  pic16= new Image(); 
  pic16.src="images/menu/knowledge-off.gif";
}