//Define Image Prefixes
var tab1Pre = "tab_atw_nbadaily_";
var tab2Pre = "tab_atw_espn_";
var tab3Pre = "";
var tab4Pre = "";

//checks browser and sets up layers accordingly
if (document.layers) {
	layerRef="document.layers.";
}

function showLayer(layerName){
	if(document.layers){
		eval(layerRef+layerName+'.visibility="visible"');
	}else{
		eval('document.getElementById('+ "'" + layerName + "'" +').style.visibility = "visible"');
	}
}
 	
function hideLayer(layerName){
	 if(document.layers){
		eval(layerRef+layerName+'.visibility="hidden"');
	}else{
		eval('document.getElementById('+ "'" + layerName + "'" +').style.visibility = "hidden"');		
	}
}

var activeImgName = "img1";
var loaded = false;

if (document.images) {
    img1off = new Image();img1off.src = "http://cache.nba.com/media/nbav2/" + tab1Pre + "off.gif";
    img2off = new Image();img2off.src = "http://cache.nba.com/media/nbav2/" + tab2Pre + "off.gif";
   //  img3off = new Image();img3off.src = "http://cache.nba.com/media/nbav2/" + tab3Pre + "off.gif";
    //img4off = new Image();img4off.src = "/media/nbav2/" + tab4Pre + "off.gif";
    img1on = new Image();img1on.src = "http://cache.nba.com/media/nbav2/" + tab1Pre + "on.gif";
    img2on = new Image();img2on.src = "http://cache.nba.com/media/nbav2/" + tab2Pre + "on.gif";
   // img3on = new Image();img3on.src = "http://cache.nba.com/media/nbav2/" + tab3Pre + "on.gif";
    //img4on = new Image();img4on.src = "/media/nbav2/" + tab4Pre + "on.gif";
}

function updateTabs(imgName) {
	if(imgName == activeImgName)
		return;
		
	if (document.images) {
		document[imgName].src = eval(imgName+"on.src");
        document[activeImgName].src = eval(activeImgName+"off.src");
		activeImgName = imgName;
    }
}