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 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 eraseCookie(name) {
	setCookie(name,"",-1);
}