var array = document.cookie.split('; ');
	var i = 0;
	var str = '';
	while(array[i]){
		if(array[i].substr(0,9) == 'footmark='){
			str = array[i].substr(9,array[i].length);
		}
		i++;
	}
	if(str == ''){
		var ref = document.referrer;
		var exp = new Date();
		exp.setTime(exp.getTime()+1000*60*60*24*1);
		document.cookie = "footmark=" + ref + "; expires=" + exp.toGMTString();
	}