function readCookieName()
{
    var the_cookie = document.cookie;
    var ss = the_cookie.split(";");
	for(i=0;i<ss.length;i++) {
		s=ss[i];
		if( s.indexOf('ONCITY_LOGIN_SSN=')!=-1 ) {
			var sss=s.split("ONCITY_LOGIN_SSN=");
			login_name=sss[1];
			return login_name;
		}		
	}
	return '';
}

login_name = readCookieName();