if(document.images)
 {         
		 prop1on=new Image();          
		 prop1on.src="images/navpropr.jpg";    
		 phil2on=new Image();          
		 phil2on.src="images/navphilosophyr.jpg"; 
		 what3on=new Image();          
		 what3on.src="images/navwhatr.jpg";    
		 team4on=new Image();          
		 team4on.src="images/navteamr.jpg";    
		 news5on=new Image();          
		 news5on.src="images/navnewsr.jpg";    
		 cont6on=new Image();          
		 cont6on.src="images/navcontactr.jpg";
		 home7on=new Image();          
		 home7on.src="images/navhomer.jpg";         
		 
		 prop1off=new Image();       
		 prop1off.src="images/navprop.jpg"; 
		 phil2off=new Image();       
		 phil2off.src="images/navphilosophy.jpg"; 
		 what3off=new Image();       
		 what3off.src="images/navwhat.jpg"; 
		 team4off=new Image();       
		 team4off.src="images/navteam.jpg"; 
		 news5off=new Image();       
		 news5off.src="images/navnews.jpg"; 
		 cont6off=new Image();       
		 cont6off.src="images/navcontact.jpg"; 
		 home7off=new Image();       
		 home7off.src="images/navhome.jpg";
		 

}

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;
 }
}