var slider;
function sliderInit() { 
  slider = YAHOO.widget.Slider.getHorizSlider("slider_background", "slider_thumb_button", 65, 65, 19);
  slider.animate = false;
  
          slider.subscribe("change", function() { 
               var valueNow = slider.getValue();
               var valueMin = slider.thumb.rightConstraint;
               var valueMax = slider.thumb.leftConstraint;

                      var result = 0 - (valueMax - valueMin - valueNow) / 19;
                      result = Math.round(result);
					  var casenum = result + 4;
					  if (navigator.userAgent.indexOf("WebKit")>=0 && navigator.userAgent.indexOf("WebKit/5")==-1) {
						// if browser uses WebKit decrese the value by one due to a yahoo slider bug
					  	casenum--;
					  }
					  var message = '';
						switch (casenum) {
						case 1: message='3 grades easier'; break;
						case 2: message='2 grades easier'; break;
						case 3: message='1 grade easier'; break;
						case 4: message='same reading level'; break;
						case 5: message='1 grade harder'; break;
						case 6: message='2 grades harder'; break;
 						case 7: message='3 grades harder'; break;
						default: message='same reading level'; break;
						}
						
                      YAHOO.util.Dom.get("grade_level").innerHTML = message;
             });
} 
//sliderInit();

var sliderNav;
var isSliderNavInitialized = false;
function sliderNavInit() { 
	if(!isSliderNavInitialized)
	{
	  sliderNav = YAHOO.widget.Slider.getHorizSlider("sliderNav_background", "sliderNav_thumb_button", 65, 65, 19);
	  sliderNav.animate = false;
	  isSliderNavInitialized = true;
	}  
  
          sliderNav.subscribe("change", function() { 
               var valueNowNav = sliderNav.getValue();
               var valueMinNav = sliderNav.thumb.rightConstraint;
               var valueMaxNav = sliderNav.thumb.leftConstraint;

                      var resultNav = 0 - (valueMaxNav - valueMinNav - valueNowNav) / 19;
                      resultNav = Math.round(resultNav);
					  var casenumNav = resultNav + 4;
					  if (navigator.userAgent.indexOf("WebKit")>=0 && navigator.userAgent.indexOf("WebKit/5")==-1) {
						// if browser uses WebKit decrese the value by one due to a yahoo slider bug
					  	casenumNav--;
					  }
					  var messageNav = '';
						switch (casenumNav) {
						case 1: messageNav='3 grades easier'; break;
						case 2: messageNav='2 grades easier'; break;
						case 3: messageNav='1 grade easier'; break;
						case 4: messageNav='same reading level'; break;
						case 5: messageNav='1 grade harder'; break;
						case 6: messageNav='2 grades harder'; break;
 						case 7: messageNav='3 grades harder'; break;
						default: messageNav='feedback not working'; break;
						}
						
                      YAHOO.util.Dom.get("grade_level_nav").innerHTML = messageNav;
             });
}