// increases the font and adjusts the article layout
function increaseFont(){
	// get the current value from the cookie
	var cv1 = readCookie("iwpruserdata");
	if (cv1){
		cookieValues = parseCookie(cv1);
	} else {
		cookieValues[1] = 13.3;
	}
	//alert(cookieValues[1]);
	var currentFontSize = parseInt(cookieValues[1]);
	var newFontSize = currentFontSize + 2;
	if (newFontSize > 20){
		newFontSize = 20;
	}
	// save new value in the cookie
	var cv = "columnMode:" + cookieValues[0] + "&fontSize:" + newFontSize + "&clippings:" + cookieValues[2];
	createCookie("iwpruserdata",cv,7);
	
	// re-draw article
	lineHeight = newFontSize + Math.round(.3 * newFontSize);
	for (var i = 0; i < 3; i++){
//		obj = document.getElementById("at" + i);
		obj = document.getElementById("article1");
		obj.style.fontSize = newFontSize + "px";
		obj.style.lineHeight = lineHeight + "px";
	}			
//	setArticleHeight();
//	layoutArticles();
}

// increases the font and adjusts the article layout
function decreaseFont(){
	// get the current value from the cookie
	var cv1 = readCookie("iwpruserdata");
	if (cv1){
		cookieValues = parseCookie(cv1);
	} else {
		cookieValues[1] = 8;
	}
	var currentFontSize = parseInt(cookieValues[1]);
	var newFontSize = currentFontSize - 2;
	if (newFontSize < 6){
		newFontSize = 6;
	}
	// save new value in the cookie
	var cv = "columnMode:" + cookieValues[0] + "&fontSize:" + newFontSize + "&clippings:" + cookieValues[2];
	createCookie("iwpruserdata",cv,7);
	// re-draw article
	lineHeight = newFontSize + Math.round(.3 * newFontSize);
	for (var i = 0; i < 3; i++){
		//obj = document.getElementById("at" + i);
		obj = document.getElementById("article1");
		obj.style.fontSize = newFontSize + "px";
		obj.style.lineHeight = lineHeight + "px";
	}			
//	setArticleHeight();
//	layoutArticles();
}
// creates a cookie with the given parameters
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=/";
}

// locates and reads the value of a cookie with a specified name
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;
}

// deletes a cookie with a specified name
function eraseCookie(name){
	createCookie(name,"",-1);
}

// parses the value of the cookie
// returns an array of the different values
function parseCookie(cookievalues){
	if (cookieValues.length > 0){
		var cookieValuesArray = new Array(3);
		var CookiesArray = cookievalues.split("&");
		for (var i = 0; i < CookiesArray.length; i++){
			var v = CookiesArray[i].split(":");
			cookieValuesArray[i] = v[1];
		}
		return cookieValuesArray;
	} else {
		return null;
	}
}

// cookieValues is a global variable that is an array of the different
// cookie values.  Check first if the cookie exists, if not then create 
// a cookie with the default values.
var cookieValues = new Array(3);
var cv = readCookie("iwpruserdata");
if (cv){
	cookieValues = parseCookie(cv);
// else, there is no cookie so try to create one
} else {
	createCookie("iwpruserdata","columnMode:3&fontSize:8&clippings:",7);
	cv = readCookie("iwpruserdata");
	if (cv){
		// the cookie was created, parse the values
		cookieValues = parseCookie(cv);
	} else {
		// the cookie was not created, use default values,
		// i.e. cookies may be blocked
		cookieValues[0] = "3"; // column mode
		cookieValues[1] = "8"; // font size
		cookieValues[2] = ""; // clippings (leave it empty)
	}
}