var _global_flag;
var _init = 1;

function loadSession(){
	var flg = readCookie('fontsize');
	changeFontSize(flg);
    _global_flag = flg;
}

function styleChange() {
    if(_global_flag == 'true') {
			_global_flag = 'false';
		} else {
 			_global_flag = 'true';
		}
    changeFontSize(_global_flag);
}

function setActiveStyleSheet(title) {
  var i, a, main;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel") && a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title")) {
      a.disabled = true;
      if(a.getAttribute("title") == title) a.disabled = false;
    }
  }
}

function getActiveStyleSheet() {
  var i, a;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel") && a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title") && !a.disabled) return a.getAttribute("title"); 
  }
  return null;
}

function getPreferredStyleSheet() {
  var i, a;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel") && a.getAttribute("rel").indexOf("style") != -1
       && a.getAttribute("rel").indexOf("alt") == -1
       && a.getAttribute("title")
       ) return a.getAttribute("title");
  }
  return null;
}

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 expires = "";
  document.cookie = name+"="+value+expires+"; path=/";
}

function changeFontSize(flg) {
	var img = document.getElementById('styleChange');

	if(flg == 'true') {
	    setActiveStyleSheet('large');
	    if(img) img.src = '../img/topbt_texs.gif';
	} else {
	    setActiveStyleSheet('small');
	    if(img) img.src = '../img/topbt_texl.gif';
	}
	createCookie('fontsize', flg, 1);
}

function loadImage (img){
	var path;
	if(_global_flag) {
	    path = '../img/topbt_texs.gif';
	} else {
	    path = '../img/topbt_texl.gif';
	}
	
	if(_init) {
    	_init = 0;
	    img.src = path;
	}
		_init = 0;
}

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 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;
}