//
function createCookie(name,value,days) {
if (days) {
var date = new Date();
date.setTime(date.getTime()+(days*24*60*60*1000));
var expires = "; expires="+date.toGMTString();
}
else var expires = "";
document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
var nameEQ = name + "=";
var ca = document.cookie.split(';');
for(var i=0;i < ca.length;i++) {
var c = ca[i];
while (c.charAt(0)==' ') c = c.substring(1,c.length);
if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
}
return null;
}

function eraseCookie(name) {
createCookie(name,"",-1);
}


function no_goback(){
var no_goback_flag = readCookie('no_goback');

if (!no_goback_flag) {
if (!top.location.search.match(/[&\?]no_goback$/)) {
createCookie('no_goback', top.location.href);
top.location.search += top.location.search ? '&no_goback' : '?no_goback';
}
} else if (top.location.search.match(/[&\?]no_goback$/)) {
top.location.href = no_goback_flag;
}

}