function setCookie(a,b,c){var d=new Date();d.setTime(d.getTime()+(c*24*3600*1000));document.cookie=a+"="+escape(b)+((c==null)?"":"; expires="+d.toGMTString())}function getCookie(a){if(document.cookie.length>0){begin=document.cookie.indexOf(a+"=");if(begin!=-1){begin+=a.length+1;end=document.cookie.indexOf(";",begin);if(end==-1)end=document.cookie.length;return unescape(document.cookie.substring(begin,end))}}return null}function delCookie(a){if(getCookie(a)){document.cookie=a+"="+"; expires=Thu, 01-Jan-70 00:00:01 GMT"}}