if(document.images){

		_what_on=new Image();
		_what_on.src="images/nav_what_l.gif";
		
		_what_off=new Image();
		_what_off.src="images/nav_what.gif";

		_done_on=new Image();
		_done_on.src="images/nav_done_l.gif";
		
		_done_off=new Image();
		_done_off.src="images/nav_done.gif";		
		
		_res_on=new Image();
		_res_on.src="images/nav_res_l.gif";
		
		_res_off=new Image();
		_res_off.src="images/nav_res.gif";		

		_who_on=new Image();
		_who_on.src="images/nav_who_l.gif";
		
		_who_off=new Image();
		_who_off.src="images/nav_who.gif";		

		_contact_on=new Image();
		_contact_on.src="images/nav_contact_l.gif";
		
		_contact_off=new Image();
		_contact_off.src="images/nav_contact.gif";		
		}
		
		function img_act(imgName) {
		             {
					 if (document.images) { 
		             imgOn = eval(imgName + "on.src");
		             document [imgName].src = imgOn;}
		             }
		     }
		
		function img_inact(imgName) {
		             {
					if (document.images) { 
		             imgOff = eval(imgName + "off.src");
		             document [imgName].src = imgOff;}
		             }
		    }