billboardAdState=new Array(2);
billboardAdState[0]=-1;
billboardAdState[1]=-1;

 function expandBillBoardAd(id) { 
	var ns = (navigator.appName.indexOf("Netscape") != -1);

	var pWidth=900;
	var cWidth=560;
	var bWidth=ns?window.innerWidth:window.document.body.clientWidth;
	if (bWidth<pWidth) bWidth=pWidth;
	var bTrim=ns?10:5;

	if (id=="BillboardDivID1")
	{
		billboardAdState[0]=1;
		document.getElementById(id).style.width = "560px";
		document.getElementById(id).style.height = "300px";
		document.getElementById(id).style.left = ""+(((bWidth-pWidth)/2)+pWidth-cWidth-bTrim)+"px";
		document.getElementById(id).style.top = "245px";
		document.getElementById(id).style.zIndex = 100000;
	}
	else if (id=="BillboardDivID2")
	{
		billboardAdState[1]=1;
		document.getElementById(id).style.width = "560px";
		document.getElementById(id).style.height = "300px";
		document.getElementById(id).style.left = ""+(((bWidth-pWidth)/2)+pWidth-cWidth-bTrim)+"px";
		document.getElementById(id).style.top = "495px";
		document.getElementById(id).style.zIndex = 100000;
	}
 }   

 function collapseBillBoardAd(id) {
	var ns = (navigator.appName.indexOf("Netscape") != -1);

	var pWidth=900;
	var cWidth=300;
	var bWidth=ns?window.innerWidth:window.document.body.clientWidth;
	if (bWidth<pWidth) bWidth=pWidth;
	var bTrim=ns?10:5;

	if (id=="BillboardDivID1")
	{
		billboardAdState[0]=0;
		document.getElementById(id).style.width = "300px";
		document.getElementById(id).style.height = "250px";
		document.getElementById(id).style.left = ""+(((bWidth-pWidth)/2)+pWidth-cWidth-bTrim)+"px";
		document.getElementById(id).style.top = "245px";
		document.getElementById(id).style.zIndex = 100000;
	}
	else if (id=="BillboardDivID2")
	{
		billboardAdState[1]=0;
		document.getElementById(id).style.width = "300px";
		document.getElementById(id).style.height = "250px";
		document.getElementById(id).style.left = ""+(((bWidth-pWidth)/2)+pWidth-cWidth-bTrim)+"px";
		document.getElementById(id).style.top = "495px";
		document.getElementById(id).style.zIndex = 100000;
	}
 }   

 function adjustBillboardAdLocation()
 {
	if (billboardAdState[0]==0) collapseBillBoardAd("BillboardDivID1");
	else if (billboardAdState[0]==1) expandBillBoardAd("BillboardDivID1");

	if (billboardAdState[1]==0) collapseBillBoardAd("BillboardDivID2");
	else if (billboardAdState[1]==1) expandBillBoardAd("BillboardDivID2");
 }