var chb=true;

function imgOn(imgName) {
  if (document.images) {
    document[imgName].src=eval(imgName+"on.src");
  }
}

function imgOff(imgName) {
  if (document.images) {
    document[imgName].src=eval(imgName+"off.src");
  }
}

if (loadCookie("audio")=="true") 
{
	chb.checked = true;
	imgOn('img1');
}
else 
{
	chb.checked = false;
	imgOff('img1');
}	

function chbox(e)
{
	if (e.checked) {
		saveCookie("audio","true",10,"/");
		imgOn('img1');
	}else{
		saveCookie("audio","false",10,"/");
		imgOff('img1');
	}
}
function saveCookie(arg1,arg2,arg3,arg4){ //arg1=dataname arg2=data arg3=expiration days

	if(arg1&&arg2){

		if(arg3){

			xDay = new Date;

			xDay.setDate(xDay.getDate() + eval(arg3));

			xDay = xDay.toGMTString();

			_exp = ";expires=" + xDay;

		}

		else _exp ="";

		if(arg4){
			_path = ";path=" + arg4;
		}
		else _path= "";
		document.cookie = escape(arg1) + "=" + escape(arg2) + _exp + _path +";";

	}

}

function loadCookie(arg){ //arg=dataname

	if(arg){

		cookieData = document.cookie + ";" ;

		arg = escape(arg);

		startPoint1 = cookieData.indexOf(arg);

		startPoint2 = cookieData.indexOf("=",startPoint1) +1;

		endPoint = cookieData.indexOf(";",startPoint1);

		if(startPoint2 < endPoint && startPoint1 > -1 &&startPoint2-startPoint1 == arg.length+1){

			cookieData = cookieData.substring(startPoint2,endPoint);

			cookieData = unescape(cookieData);

			return cookieData

		}

	}

	return false

}