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function Trim(strValue) { return strValue.replace(/^\s+|\s+$/g, ''); } function getCookie(key) { var result = false; if(document.cookie) { var mycookieArray = document.cookie.split(';'); for(i=0; i<mycookieArray.length; i++) { var mykeyValue = mycookieArray[i].split('='); if(Trim(mykeyValue[0]) == key) result = mykeyValue[1]; } } return result; } function setCookie(key, value, hoursExpire) { var ablauf = new Date(); var expireTime = ablauf.getTime() + (hoursExpire * 60 * 60 * 1000); ablauf.setTime(expireTime); document.cookie = key + "=" + value + "; expires=" + ablauf.toGMTString(); } var mycookie = getCookie('meincookie'); if(!mycookie) { // do whatever you want if the cookie is not set setCookie('meincookie', 'true', 24); } else { // do whatever you want if the cookie is set // mycookie contains the cookie value }