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())+";path=/";
}

function checkCookie()
{
tooltips=getCookie('username');
if (tooltips!=null && tooltips!="")
  {
  alert('Welcome again '+tooltips+'!');
  }
  else 
  {
  tooltips=prompt('Please enter your name:',"");
  if (tooltips!=null && tooltips!="")
    {
    setCookie('tooltips',tooltips,365);
    }
  }
}