function setCookie(name,value,days){
        if (days){
                var date = new Date();
                date.setTime(date.getTime()+(days*24*60*60*1000));
                var expires = "; expires="+date.toGMTString();
        }
        else var expires = "";
        document.cookie = name+"="+value+expires+"; path=/";
}

function getCookie(name){
        var nameEQ = name + "=";
        var ca = document.cookie.split(';');
        for(var i=0;i < ca.length;i++){
                var c = ca[i];
                while (c.charAt(0)==' ') c = c.substring(1,c.length);
                if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
        }
        return null;
}

function eraseCookie(name){
        createCookie(name,"",-1);
}
function show(submenuId,subMenuPic,visible,hide_pic,show_pic){
	var showElement
	if (getCookie(submenuId))
		showElement = getCookie(submenuId);
	else {
		showElement = visible;
		setCookie(submenuId,visible);
	}
	eval("showElement="+showElement+";");
	
	var element = document.getElementById(submenuId);
	var pic = document.getElementById(subMenuPic);
	if (showElement){
		element.style.display = "block";
		pic.src="graphics/"+hide_pic;
	}else{ 
		element.style.display = "none";
		pic.src="graphics/"+show_pic;
	}
}

function flipShow(submenuId,subMenuPic,hide_pic,show_pic){
	var showElement = getCookie(submenuId);
	
	eval("showElement=!"+showElement+";");
	
	var element = document.getElementById(submenuId);
	var pic = document.getElementById(subMenuPic);
	if (showElement){
		element.style.display = "block";
		pic.src="graphics/"+hide_pic;
	}else{ 
		element.style.display = "none";
		pic.src="graphics/"+show_pic;
	}
	setCookie(submenuId,showElement); 
}