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 checkCookie(c_name)
{
c_value=getCookie(c_name);
if (c_value!=null && c_value!="")
  {
  return true;
  }
else
  {
  return false;
  }
}

if(checkCookie('enmag[width]') === false || getCookie('enmag[width]') != screen.width){
setCookie('enmag[width]',screen.width,5);
document.location = './';
}

if(checkCookie('enmag[height]') === false || getCookie('enmag[height]') != screen.height){
setCookie('enmag[height]',screen.height,5);
document.location = './';
}