// JavaScript Document

function getCookie(c_name)
{
if (document.cookie.length>0)
  {
  c_start=document.cookie.indexOf(c_name + "=");
  if (c_start!=-1)
    { 
    c_start=c_start + c_name.length+1; 
    c_end=document.cookie.indexOf(";",c_start);
    if (c_end==-1) c_end=document.cookie.length;
    return unescape(document.cookie.substring(c_start,c_end));
    } 
  }
return "";
}

function setCookie(c_name,value,expiredays)
{
var exdate=new Date();
exdate.setDate(exdate.getDate()+expiredays);
document.cookie=c_name+ "=" +escape(value)+
((expiredays==null) ? "" : ";expires="+exdate.toGMTString());
}

function showOverlay()
{
var display;	
var overlay;
overlay=getCookie('overlay');
//alert(overlay);
if (overlay!=null && overlay!="")
  {
   	display='none';

  }
  else 
  {
    display='block';
    setCookie('overlay',display,365);
  }
  //alert(display);
  document.getElementById('overlay').style.display=display;	
}