function setCookie(cname,cvalue,exdays) {
if (exdays==0) {
document.cookie = cname+"="+cvalue;
} else {
var d = new Date();
d.setTime(d.getTime() + (exdays*24*60*60*1000));
var expires = "expires=" + d.toGMTString();
document.cookie = cname+"="+cvalue+"; "+expires;
}
}
function getCookie(cname) {
var name = cname + "=";
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);
if (c.indexOf(name)>-1) {
return c.substring(name.length, c.length);
}
}
return "";
}
function deleteCookie(cname,exdays) {
if (getCookie(cname)!="") {
var expire = new Date (); 
expire.setTime(expire.getTime() - (24 * 60 * 60 * 1000)); 
document.cookie = cname + "=; expires=" + expire.toGMTString();
}
}