function showThis(id) {
		var divs=document.getElementsByTagName('div');
		for(var i=0; i<divs.length; i++) {
			if(divs[i].className.indexOf('blink')==-1) continue;
			if(divs[i].getAttribute('id')!=id){
				divs[i].style.display= 'none';
			}else {
				divs[i].style.display= 'block';
			}
		}
	}
	function showThat(id) {
		var divs=document.getElementsByTagName('div');
		for(var i=0; i<divs.length; i++) {
			if(divs[i].className.indexOf('show-hide')==-1) continue;
			if(divs[i].getAttribute('id')!=id){
				divs[i].style.display= 'none';
			}else {
				divs[i].style.display= 'block';
			}
		}
	}
	function prepbots() {
		if(!document.getElementById || !document.getElementsByTagName) return;
		var nav = document.getElementById("tab-2-nav");
		var links = nav.getElementsByTagName("a");
		document.getElementById("ibooks-link").style.background= '#c6c7c8';
		for(var i=0; i<links.length;i++) {
			var selectionId= links[i].getAttribute('href').split('#')[1];
			if(!document.getElementById(selectionId)) continue;
			document.getElementById(selectionId).style.display= 'none';
			document.getElementById("ibooks").style.display= 'block';
			links[i].distination= selectionId;
			links[i].onclick= function () {
				for(var i=0; i<links.length; i++){
					links[i].style.background= "#939495";
				}
				showThis(this.distination);
				this.style.background= '#c6c7c8';
				return false;
			}
		}
		var nav2 = document.getElementById("tab-1-nav");
		var links2 = nav2.getElementsByTagName("a");
		document.getElementById("lessons-link").style.background= '#c6c7c8';
		for(var i=0; i<links2.length;i++) {
			var selectionId= links2[i].getAttribute('href').split('#')[1];
			if(!document.getElementById(selectionId)) continue;
			document.getElementById(selectionId).style.display= 'none';
			document.getElementById("lessons").style.display= 'block';
			links2[i].distination= selectionId;
			links2[i].onclick= function () {
				for(var i=0; i<links2.length; i++){
					links2[i].style.background= "#939495";
				}
				showThat(this.distination);
				this.style.background= '#c6c7c8';
				return false;
			}
		}
	}
window.onload = prepbots();