var standard=(readCookie('txtsize')==null)?1:readCookie('txtsize');

function changeFontSize(inc)
{
  var p = document.getElementsByTagName('body');
  for(n=0; n<p.length; n++) {
    if(p[n].style.fontSize) {
       var size = parseInt(p[n].style.fontSize.replace("em", ""));
    } else {
       var size = 1;
    }
    p[n].style.fontSize = inc + 'em';
   }
   createCookie('txtsize',inc,'30');
}

function resetFontSize() {
   var p = document.getElementsByTagName('body');
   for(i=0;i<p.length;i++) {
      p[i].style.fontSize = standard + "em";
   }
}

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;
}