var textsize = 10;
var cookiename = "fontsize";

function changetextsize(up){
	if(up){
		textsize = parseFloat(textsize)+2;
	}else{
		textsize =parseFloat(textsize)-2;
	}
}

function fsize(size,unit,id){
	var vfontsize = document.getElementById(id);
	textsize = size;
	if(vfontsize){
		vfontsize.style.fontSize = textsize + unit;
	}
}

function alterSize(id, increase){
	var vfontsize = document.getElementById(id);
	if(vfontsize){
		if (increase == 1) {
			textsize++;
		} 
		if (increase == -1) {
			textsize--;
		} 
		if (increase == 0) {
			textsize = 10;
		}
		vfontsize.style.fontSize = textsize + 'px';
		createCookie(textsize, 365);
	}
}

function createCookie(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 = cookiename+"="+value+expires+"; path=/";
}

function readCookie() {
	var nameEQ = cookiename + "=";
	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) {
			fsize(c.substring(nameEQ.length,c.length), 'px', 'body');
		}
	}
}