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 + "=";
	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;
}

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


function changeFontSize(inc) {
	var current = readCookie('FontSize');
	var newfont;
	
	if (current == null) {
		newfont = 0;
	}
	else {
		eraseCookie('FontSize');
		newfont = parseInt(current);
	}
	
	// increment
	if ((inc == 1) && (current < 2)) {
		newfont = newfont + 1;
	}	
	// decrement
	else if ((inc == -1) && (current > -1)) {
		newfont = newfont - 1;
	}
	
	createCookie('FontSize', newfont, 1);
	
	window.location.reload();
	/*
	var divi = new Array();
	divi[0] = "resitve_content";
	divi[1] = "resitve_content2";
	divi[2] = "sub_content";

	for (var i in divi) {
		var container = document.getElementById(divi[i]); 
		
		if (container != null) {
			var p = container.getElementsByTagName("p");
			var li = container.getElementsByTagName("li");
			var td = container.getElementsByTagName("td");
	
			for (n=0; n<p.length; n++){
				if (p[n].style.fontSize) {
					var size = parseInt(p[n].style.fontSize.replace("px", ""));
				} 
				else {
					var size = 12;
				}
				p[n].style.fontSize = size + inc + 'px';
			}
			
			for (n=0; n<li.length; n++) {
				if (li[n].style.fontSize) {
					var size = parseInt(li[n].style.fontSize.replace("px", ""));
				}
				else {
					var size = 12;
				}
				li[n].style.fontSize = size+inc + 'px';
			}
			
			for (n=0; n<td.length; n++){
				if (td[n].style.fontSize) {
					var size = parseInt(td[n].style.fontSize.replace("px", ""));
				}
				else {
					var size = 12;
				}
				
				td[n].style.fontSize = size+inc + 'px';
			}
		}
	}
	*/
}