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

function deleteCookie(c_name) {
	var exdate=new Date();
	exdate.setDate(exdate.getDate()-2);
	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 checkCookie(c_name) {
	product=getCookie(c_name);
	if (product!=null && product!="")
	{
		//alert('Cookie (product) is '+product);
		//
		// return value
		return product;
	}
	else 
	{
		return null;
	}
}