var fontSizeUnit = "%";
var perOrder = 10;
var defaultSize = 100;
var ckName = "ud_face";
var ckDays = 2;
var ckPath = "/"
var fsCK = getCookie(ckName);

if(fsCK == null){
  var currentSize = defaultSize;  
}else{
  var currentSize = eval(fsCK);
}

//currentSize_h1 = currentSize + 100;
//currentSize_h2 = currentSize + 20;
document.writeln( '<style type="text/css" media="screen,print,tv">' );
document.write( 'body{font-size:' + currentSize + fontSizeUnit+ '}' );
//document.write( 'h1{font-size:' + currentSize_h1 + fontSizeUnit+ '}' );
//document.write( 'h2{font-size:' + currentSize_h2 + fontSizeUnit+ '}' );
document.writeln( '</style>' );

function chengeFontSize(mode){
  if(mode == "larger"){
    var newSize = Number(currentSize + perOrder);
    setCookie(ckName , newSize);
  }

  if(mode == "smaller"){
    if (currentSize != perOrder){
      var newSize = Number(currentSize - perOrder);
      setCookie(ckName , newSize);
    }else{
      var newSize = Number(currentSize);
    }
  }

  if(mode == "default"){
    deleteCookie(ckName);
  }

  location.reload();
}


function setCookie(name,value){
  var dobj = new Date();

  dobj.setTime(dobj.getTime() + 24 * 60 * 60 * ckDays * 1000);

  var expiryDate = dobj.toGMTString();

  document.cookie = name + '=' + escape(value) + ';expires=' + expiryDate + ';path=' + ckPath;
}

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));
}


function deleteCookie(name){
  if (getCookie(name)){
    document.cookie = name + '=' +
    '; expires=Thu, 01-Jan-70 00:00:01 GMT;path='+ckPath;
  }
}