var Pic = new Array();
Pic[0] = 'images/header_bg.gif'

var p = Pic.length;

var preLoad = new Array();
for (r = 0; r < p; r++){
   preLoad[r] = new Image();
   preLoad[r].src = Pic[r];
}

images = new Array();
images[0]='used'
images[1]='certified'

var j=0;
var navImg = new Array;
var navImgo = new Array;
for(j=0; j<images.length; j++) 
{
	navImg[j] = new Image();
	navImg[j].src='images/nav_'+images[j]+'.gif';
	navImgo[j] = new Image();
	navImgo[j].src='images/nav_'+images[j]+'_live.gif';
}

function navOver(i) {
	document['navImg' + i].src = navImgo[i].src;
}

function navOff(i) {
	document['navImg' + i].src = navImg[i].src;
}