/* 
* YP's koekjestrommel.....
*/

function kiesLogout () {
                 document.getElementById("loginbutt").className="invisible0";
}
function kiesLogin () {
                 document.getElementById("logoutbutt").className="invisible0";
}

function kiesLoginLogout() {
    if (document.URL.indexOf("&sidin=")>0) {
         createCookie("TUDCMSINTRA","butts",1);
    }
    else if (document.URL.indexOf("&sidout=")>0) {
         eraseCookie("TUDCMSINTRA");
    }
    
    if (GetCookie("TUDCMSINTRA") ) {
          kiesLogout();
    }
    else {
          kiesLogin();
    }
}


function GetCookie( name ) {
  var arg = name + "=";
  var alen = arg.length;
  var clen = document.cookie.length;
  var i = 0;
  while ( i < clen ) {
    var j = i + alen;
    if ( document.cookie.substring(i, j) == arg ) return getCookieVal(j);
    i = document.cookie.indexOf( " ", i ) + 1;
    if ( i == 0 ) break;
  }
  return null;
}

function getCookieVal (offset) {
  var endstr = document.cookie.indexOf (";", offset);
  if (endstr == -1)
    endstr = document.cookie.length;
  return unescape(document.cookie.substring(offset, endstr));
}

/* 
 *
 *Enkele leuke alternatiefjes uit de koekjestrommel.........
 */
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);
}