//set coockie
function setCookie(c_name,value,exdays)
{
	var exdate=new Date();
	exdate.setDate(exdate.getDate() + exdays);
	var c_value=escape(value) + ((exdays==null) ? "" : "; expires="+exdate.toUTCString());
	document.cookie=c_name + "=" + c_value;
}
//get coockie
function getCookie(c_name)
{
	var i,x,y,ARRcookies=document.cookie.split(";");
	for (i=0;i<ARRcookies.length;i++)
	{
	  x=ARRcookies[i].substr(0,ARRcookies[i].indexOf("="));
	  y=ARRcookies[i].substr(ARRcookies[i].indexOf("=")+1);
	  x=x.replace(/^\s+|\s+$/g,"");
	  if (x==c_name)
	    {
	    return unescape(y);
	    }
	  }
}
//destroy cookie
function deleteCookie(name) {
		var expdate = new Date();
		expdate.setTime(expdate.getTime() - 1);
		document.cookie = name += "=; expires=" + expdate.toGMTString();
}