var active_TN = ""; // these are need to prevent a javascript error in NS
var active_SN = "";
var active_LN = "";

if (document.images) {

	// home page nav
	nav_ols_on = new Image();
	nav_ols_on.src = "img/hm_nav_ols_on.gif";
	nav_powered_on = new Image();
	nav_powered_on.src = "img/hm_nav_powered_on.gif";
	nav_localization_on = new Image();
	nav_localization_on.src = "img/hm_nav_localization_on.gif";
	
	nav_ols_off = new Image();
	nav_ols_off.src = "img/hm_nav_ols_off.gif";
	nav_powered_off = new Image();
	nav_powered_off.src = "img/hm_nav_powered_off.gif";
	nav_localization_off = new Image();
	nav_localization_off.src = "img/hm_nav_localization_off.gif";
										
}

/*
Functions are down here
*/

// Function to 'activate' images.
function imgOn(imgName) {
	if (document.images) {
		document[imgName].src = eval(imgName + "_on.src");
	}
}

// Function to 'deactivate' images.
function imgOff(imgName) {
	if ((imgName == active_TN) || (imgName == active_SN) || (imgName == active_LN)) {}
	else {
		if (document.images) {
			document[imgName].src = eval(imgName + "_off.src");
		}
	}
}