//preloads mouseover image for navigation
var btnOn = new Image();
btnOn.src = 'images/button-on.gif';

//function to swap bgs on the buttons
function swapBG(x,s){
	var id = x;
	var status = s;
	
	if(status == 'on'){ document.getElementById(id).style.backgroundImage = 'url(images/button-on.gif)'; }
	else if(status == 'off'){ document.getElementById(id).style.backgroundImage = 'url(images/button-off.gif)'; }
}