// ***** Event *****

window.onload = function() {
	// --- 文字調整
	var cookie = readCookie("style");
	var title = cookie ? cookie : getActiveStyleSheet();
	if ( !title ) {title="small";}
	setActiveStyleSheet(title);	
}

window.onunload = function() {
	// --- 文字調整（cookie保存）
	var title = getActiveStyleSheet();
	createCookie("style", title, 30);
}


//***** Change Fontsize ***** 

function setActiveStyleSheet(title) {
	var i, a, size, dirStr;
	for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
		if(a.getAttribute("href").indexOf("fontsize") != -1) {
			size = a.getAttribute("title").substring(0,1);
			// -----トップと第二階層の差を取得
			if (a.getAttribute("href").substring(0,3)=="../"){
				dirStr = "../";
			} else {
				dirStr = "";
			}
			// -----
			a.disabled = true;
			document.getElementById(("font_"+size)).src=document.getElementById(("font_"+size)).src.replace("_slct.", "_nrml.");
			if(a.getAttribute("title") == title) {
				a.disabled = false;
				document.getElementById(("font_"+size)).src=document.getElementById(("font_"+size)).src.replace("_nrml.", "_slct.");
				document.getElementById(("font_"+size)).src=document.getElementById(("font_"+size)).src.replace("_over.", "_slct.");
			}
		}
	}
}

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

function createCookie(name,value,days) {
  var mayDate, expires;
  if (days) {
    var myDate = new Date();
    myDate.setTime(myDate.getTime()+(days*24*60*60*1000));
    var expires = "; expires="+myDate.toGMTString();
  } else {
	expires = "";
  }
  document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
  var i, nameEQ, ca, c;
  var nameEQ = name + "=";
  var ca = document.cookie.split(';');
  for(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;
}