// Variable declarations
var bNames='nav_calendar nav_staff nav_values nav_worship nav_ministries nav_humor nav_links nav_guestbook'.split(' '); 
var path='/img/', btn=new Array(); 

// Preload images
for(i=0; i<bNames.length; i++) btn[bNames[i]]=new Button(bNames[i]); 

// Functions
function rollOn(name){ document[name].src=btn[name].on.src;} 
function rollOff(name){ document[name].src=btn[name].off.src;} 

function Button(name){ 
this.on=new Image(); 
this.on.src=path+name+'on.gif'; 
this.off=new Image(); 
this.off.src=path+name+'off.gif'; 
}