var maximumFontSize = 161;
window.onload = init;
function init(){
	var content_area = document.getElementById('main');
	document.getElementById('font_plus').onmouseup = function(){
		var size = 	getSize(content_area)+10;
		setSize(content_area, size);
	};
	document.getElementById('font_minus').onmouseup = function(){
		var size = 	getSize(content_area)-10;
		setSize(content_area, size);
	};
	var fz = readCookie('fontsize');
	if (!fz) {
		fz = 100;
	}
	setSize(content_area, fz);
}

function $(id){
	return document.getElementById(id);
}

function setSize(obj, size){
	if(isNaN(size)) {
		size = 100;
	}
	if(size < maximumFontSize) {
	  obj.style.fontSize = size+'%';
	} else {
	  obj.style.fontSize = maximumFontSize+'%';
	}
	createCookie('fontsize', size);
}

function getSize(obj){
	return parseFloat(obj.style.fontSize.replace('%', ''));
}

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 + "=";
	if (document.cookie) {
		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 false;
}

function eraseCookie(name) {
	createCookie(name,"",-1);
}



function collapse_expand(id) {
  var el  = document.getElementById(id);
  var img = document.getElementById(id + 'Img');
  //alert(el.style.display);
  if ( el.style.display == "none" ) {
    el.style.display = "";
    img.src = "/images/arr_up.gif";
  } else {
    el.style.display = "none";
    img.src = "/images/arr_down.gif";
  }

  return false;
}


// cookie
function addCookie(objName,objValue,objDay)
{
	var str = objName + "=" + escape(objValue);
	if(objDay > 0)
	{
		var date = new Date();
		var ms = objDay*3600*1000*24;
		date.setTime(date.getTime() + ms);
		str += "; expires=" + date.toGMTString();
	}
	document.cookie = str;
}

function getCookie(objName)
{
	var arrStr = document.cookie.split("; ");
	for(var i = 0;i < arrStr.length;i ++)
	{
		var temp = arrStr[i].split("=");
		if(temp[0] == objName)
		{
			return unescape(temp[1]);
		}
	}
}

function delCookie(name)
{
	var date = new Date();
	date.setTime(date.getTime() - 10000);
	document.cookie = name + "=a; expires=" + date.toGMTString();
}