$(document).ready(function(){
	current = 1;
	t = setTimeout(nextTab, 15500);
});

function nextTab() {
	if (current==1)
	{
		document.getElementById('slide'+current).style.display = 'none';
		current = 2;
		document.getElementById('slide'+current).style.display = 'block';
	}
	else if (current==2)
	{
		document.getElementById('slide'+current).style.display = 'none';
		current = 3;
		document.getElementById('slide'+current).style.display = 'block';
	}
	else if (current==3)
	{
		document.getElementById('slide'+current).style.display = 'none';
		current = 4;
		document.getElementById('slide'+current).style.display = 'block';
	}
	else if (current==4)
	{
		document.getElementById('slide'+current).style.display = 'none';
		current = 1;
		document.getElementById('slide'+current).style.display = 'block';
	}
	t = setTimeout(nextTab, 15500);
}

function showSlide(id) {

	document.getElementById('slide1').style.display = 'none';
	document.getElementById('slide2').style.display = 'none';
	document.getElementById('slide3').style.display = 'none';
	document.getElementById('slide4').style.display = 'none';
	current = id;
	document.getElementById('slide'+current).style.display = 'block';
	
	clearTimeout(t);
	t = setTimeout(nextTab, 15500);
}