// JavaScript Document

//show();

function show() {
        var current_cookie = readCookie("current_menu");
        if (current_cookie != null) visibility(current_cookie);
}

function visibility (id)
{

	var old_cookie = readCookie("current_menu");
	if(old_cookie == id){ 
		//redisplay selected menu
		document.getElementById(old_cookie).className='visible';
	}
	else{
        //hide old menu		
		if(old_cookie != null) document.getElementById(old_cookie).className='hide';

        //display new menu
        var check= document.getElementById(id).className;
        document.getElementById(id).className='visible';

        /*
           if(check=='hide')
           {
           document.getElementById(id).className='visible';
           }
           else
           {
           document.getElementById(id).className='hide';
           }
         */
        //save new/current menu
        createCookie("current_menu",id,1);
	}
}

function createCookie(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 readCookie(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 visibility (id)
{
var check= document.getElementById(id).className;

if(check=='hide')
{
document.getElementById(id).className='visible';
}
   else
   {
   document.getElementById(id).className='hide';
   }
}*/