var sectionId = null;

// preload main nav images
var bswRollon = new Array();
var bswRolloff = new Array();


//main nav arrays
for(i=1;i<5;i++){
	bswRolloff[i] = new Image();
	bswRolloff[i].src = "/images/nav/nav" + i + "_off.gif";	
	bswRollon[i] = new Image();
	bswRollon[i].src = "/images/nav/nav" + i + "_on.gif";	
}	

// main nav functions
function bswRollOn(num){
	
	if(num != sectionId){
		document.images["nav" + num].src = bswRollon[num].src;
	}
}

function bswRollOff(num){
	
	if(num == sectionId){
		document.images["nav" + num].src = bswRollon[num].src;
	} else {
		document.images["nav" + num].src = bswRolloff[num].src;	
	}
}