var ns4=document.layers;
var ie4=document.all;
var ns6=document.getElementById&&!document.all;

//Hide and Show Layers
var layerRef 
var styleSwitch

if (ns4){
	   layerRef = 'document.layers[';
	   styleSwitch = ']';
	} else if(ie4) {
	   layerRef = 'document.all[';
	   styleSwitch = '].style';
	} else if(ns6) {
	   layerRef = 'document.getElementById(';	
	   styleSwitch = ').style';	
	}

/* Hide Layer */
function hideLayer(layerID){
	eval(layerRef + '"' + layerID + '"' + styleSwitch + '.visibility="hidden"');
}

/* Show Layer */
function showLayer(layerID){
	eval(layerRef + '"' + layerID + '"' + styleSwitch + '.visibility="visible"');
}

/* Change BG */
function changeBG(layerID){
	eval(layerRef + '"' + layerID + '"' + styleSwitch + '.background="#6699cc"');
	eval(layerRef + '"' + layerID + '"' + styleSwitch + '.color="#000000"');
}

/* Restore BG */
function restoreBG(layerID){
	eval(layerRef + '"' + layerID + '"' + styleSwitch + '.background="#003399"');
	eval(layerRef + '"' + layerID + '"' + styleSwitch + '.color="#ffffff"');
}