function changeMenuView(divId)
{
    /*invert selected menu class to either show or hide*/
    closeAllMenus(divId);
    
    var menuDiv = document.getElementById(divId);
    
    if(menuDiv.className == 'hide')
    {
        menuDiv.className = 'show';         
        saveMenuToCookie(divId, 1);
    }
    else
    {
        menuDiv.className = 'hide';    
        eraseMenuFromCookie();            
    }
}

function closeAllMenus(divId)
{
    /*go through dom change any classes from show to hide, except selected*/
    var menuItems = document.getElementsByTagName("div");

    for(i=0; i < menuItems.length; i++)
    {
        if((menuItems[i].className == 'show')&&(menuItems[i].id != divId))
        {
            menuItems[i].className = 'hide';
        }        
    }    
}

function saveMenuToCookie(value,days) {
    var name = 'menuShown';
	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 readMenuFromCookie() {
    var name = 'menuShown';
	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 eraseMenuFromCookie() {
	saveMenuToCookie("",-1);
}