(function() {
    var Event = YAHOO.util.Event,
        Dom   = YAHOO.util.Dom,
        lang  = YAHOO.lang,
        slider, 
        bg="slider-bg", thumb="slider-thumb", 
        valuearea="slider-value", textfield="slider-converted-value"

    // The slider can move 0 pixels up
    var topConstraint = 0;

    // The slider can move 60 pixels down
    var bottomConstraint = 60;

    // Custom scale factor for converting the pixel offset into a real value
    var scaleFactor = .1;

    // The amount the slider moves when the value is changed with the arrow
    // keys
    var keyIncrement = 20;

    var tickSize = 20;

    Event.onDOMReady(function() {

        slider = YAHOO.widget.Slider.getHorizSlider(bg, 
                         thumb, topConstraint, bottomConstraint, 20);

        slider.getRealValue = function() {
            return Math.round(this.getValue() * scaleFactor);
        }

        slider.subscribe("change", function(offsetFromStart) {
            // use the scale factor to convert the pixel offset into a real
            // value
            var actualValue = slider.getRealValue();

	    document.getElementById("wrapper").style.fontSize = (11+actualValue)+'px';
            createCookie('svefSlider',actualValue,7)
        });

        slider.subscribe("slideStart", function() {
                YAHOO.log("slideStart fired", "warn");
            });

        slider.subscribe("slideEnd", function() {
                YAHOO.log("slideEnd fired", "warn");
            });

        // Listen for keystrokes on the form field that displays the
        // control's value.  While not provided by default, having a
        // form field with the slider is a good way to help keep your
        // application accessible.
        Event.on(textfield, "keydown", function(e) {

            // set the value when the 'return' key is detected
            if (Event.getCharCode(e) === 13) {
                var v = parseFloat(this.value, 10);
                v = (lang.isNumber(v)) ? v : 0;

                // convert the real value into a pixel offset
                slider.setValue(Math.round(v/scaleFactor));
            }
        });
        

        var x = readCookie('svefSlider')
        if (x) {
           slider.setValue((x*10), false); //false here means to animate if possible
        }

    });
})();


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);
}