//get platform info
	agt=navigator.userAgent.toLowerCase();
	ie=(document.all) ? 1:0
	if(ie){
		ie4=(agt.indexOf('msie 4.01')!=-1) ? 1:0
		ie5=(agt.indexOf('msie 5.01')!=-1) ? 1:0
		}
	else { ie4=0;ie5=0 }

	ns=(document.layers) ? 1:0
	ns6=(document.getElementById && !document.all) ? 1:0
	
	win=( (agt.indexOf("win")!=-1) || (agt.indexOf("16bit")!=-1) )
	mac=(agt.indexOf("mac")!=-1);

	var imgs=(document.images) ? 1:0

//preload images
if(imgs){
	//over states
	img1=new Image(1,1); img1.src="images/nav/ad_on.gif";
	img2=new Image(1,1); img2.src="images/nav/brand_on.gif";
	img3=new Image(1,1); img3.src="images/nav/central_on.gif";
	img4=new Image(1,1); img4.src="images/nav/customer_on.gif";
	img5=new Image(1,1); img5.src="images/nav/field_on.gif";
	img6=new Image(1,1); img6.src="images/nav/focus_on.gif";
	img7=new Image(1,1); img7.src="images/nav/local_on.gif";
	img8=new Image(1,1); img8.src="images/nav/nation_on.gif";
	img9=new Image(1,1); img9.src="images/nav/retail_on.gif";
	img10=new Image(1,1); img10.src="images/nav/top/company_on.gif";
	img11=new Image(1,1); img11.src="images/nav/top/contact_on.gif";
	img12=new Image(1,1); img12.src="images/nav/top/home_on.gif";
	img13=new Image(1,1); img13.src="images/nav/top/job_on.gif";
	img14=new Image(1,1); img14.src="images/nav/top/site_on.gif";
}	


//image swapper
var clickedimg="";
var overimg="";

function swpimg(theimg,newsrc){
if(imgs){
	oldsrc=document.images[theimg].src; 
	overimg=theimg;
	document.images[theimg].src=newsrc;
	}
}

function swpback(){
if(overimg!="" && overimg!=clickedimg){
	if(imgs){ document.images[overimg].src=oldsrc; }
	}
}