var preloads = [
	"nav_services",
	"nav_projects",
	"nav_contact_us",
	"nav_home",
	"nav_web_services",
	"nav_home_office",
	"nav_process",
	"nav_benefits",
]

var sImgPath = "images/";

// preload
for(var i=0; i<preloads.length; i++) {
	eval("var " + preloads[i] + "=new Image()");
	eval(preloads[i] + ".src='" + sImgPath + preloads[i] + ".gif'");
	eval("var " + preloads[i] + "_on=new Image()");
	eval(preloads[i] + "_on.src='" + sImgPath + preloads[i] + "_on" + ".gif'");
}


function swapImage(name, state) {
	document.images[name].src = eval(name + state + ".src");
}