function showVideoContent(z){
	if(z=='left1')
	{
		var a2=document.getElementById('left2');
		a2.style.display="none";
		var x2=document.getElementById('le2');
		x2.className="tab";

		var a3=document.getElementById('left3');
		a3.style.display="none";
		var x3=document.getElementById('le3');
		x3.className="tab";

		var a1=document.getElementById(z);
		a1.style.display="block";
		var x1=document.getElementById('le1');
		x1.className="tab-on";

	}
	if(z=='left2')
	{
		var a1=document.getElementById('left1');
		a1.style.display="none";
		var x1=document.getElementById('le1');
		x1.className="tab";

		var a3=document.getElementById('left3');
		a3.style.display="none";
		var x3=document.getElementById('le3');
		x3.className="tab";

		var a2=document.getElementById(z);
		a2.style.display="block";
		var x2=document.getElementById('le2');
		x2.className="tab-on";

	}
	if(z=='left3'){
		var a1=document.getElementById('left1');
		a1.style.display="none";
		var x1=document.getElementById('le1');
		x1.className="tab";

		var a2=document.getElementById('left2');
		a2.style.display="none";
		var x2=document.getElementById('le2');
		x2.className="tab";

		var a3=document.getElementById(z);
		a3.style.display="block";
		var x3=document.getElementById('le3');
		x3.className="tab-on";

	}
}