// Cookie auslesen
function getCookie(name) {
	valuesession = $.ajax( {
		url : 'fileadmin/template/main/php/usability_session_information.php?get='+name,
		async:false
	}).responseText;
	return valuesession;
}

// Cookie setzen
function setCookie(name, value) {
	if (name == "sheet") {
		$.ajax( {
			url : 'fileadmin/template/main/php/usability_session_information.php?set='+name+':'+value,
			success: function(msg) {
				document.location.reload();
	     	}
		});
	} else {
		$.ajax( {
			url : 'fileadmin/template/main/php/usability_session_information.php?set='+name+':'+value
		});
	}
}

// Schrift vergrößern
function increaseFont() {
    value = getCookie("fontsize");
    if (value) {
        if (value < 2) {
            value = Math.abs(value) + 0.05;
        }
    } else {
        value = 1;
    }
    setCookie("fontsize",value);
    var idelement = document.getElementsByTagName("body")[0];
    idelement.style.fontSize = value + "em";
}

// Schrift verkleinern
function decreaseFont() {
    value = getCookie("fontsize");
    if (value) {
        if (value > 0.1) {
            value = value - 0.05;
        }
    } else {
        value = 1;
    }
    setCookie("fontsize",value);
    var idelement = document.getElementsByTagName("body")[0];
    idelement.style.fontSize = value + "em";
}

// Schrift auf Normalgröße setzen
function resetFont() {
    var idelement = document.getElementsByTagName("body")[0];
    idelement.style.fontSize = "1em";
    setCookie("fontsize","1");
}

// Stylesheet wechseln
function loadCSS(sheet) {
    setCookie("sheet", sheet);
}