var on = false;
var fontEm;

window.onload = function(){
	actSize = getCookie("fontEm");
	fontEm = actSize;
	if (actSize == "NaN" || actSize == null){
		fontEm = 1.00;
	}
	document.body.style.fontSize = fontEm + "em";
}

function size(size){
	if (getCookie("fontEm") == "NaN" || getCookie("fontEm") == null){
		fontEm = fontEm;
	}
	else{
		fontEm = getCookie("fontEm");
	}
			
	if(size==0){
		document.body.style.fontSize = "100%";
		fontEm = 1;
		setCookie(fontEm);
	}
	else{
		fontEm = parseFloat(fontEm) + parseFloat(size);

		if (fontEm > 0.75 && fontEm < 1.75){
			document.body.style.fontSize = fontEm + "em";
		}
		else{
			if (size == -0.1){
				fontEm = fontEm + 0.1;
			}
			else{
				fontEm = fontEm - 0.1;
			}
		}
		setCookie(fontEm);
	}
}

function txt(){
	if(on == false){
		document.getElementById("mainStyle").href = "text.css";
		on = true;
	}
	else{
		javascript:location.reload()
	}
}

function setCookie(fSize){
	fSize = parseFloat(fSize);
	document.cookie = "fontEm="+fSize;
}

function getCookie(name){
    var dc = document.cookie;
    var prefix = name + "=";
    var begin = dc.indexOf("; " + prefix);
    if (begin == -1){
        begin = dc.indexOf(prefix);
        if (begin != 0) return null;
    }
    else{
        begin += 2;
    }
    var end = document.cookie.indexOf(";", begin);
    if (end == -1){
        end = dc.length;
    }
    return unescape(dc.substring(begin + prefix.length, end));
}