function central()
{
var wid = document.body.clientWidth;
	var left_pos = parseInt(wid - 504)/2;
	var left_pos2 = parseInt(wid - 1008)/2;
 	var left_pos3 = parseInt(wid - 714)/2;
 	
	document.getElementById('middle1').style.left= (left_pos + "px");
	document.getElementById('middle2').style.left= (left_pos3 + "px");
	document.getElementById('middle3').style.left= (left_pos + "px");
	document.getElementById('middle4').style.left= (left_pos + "px");
	document.getElementById('middle5').style.left= (left_pos + "px");
	document.getElementById('middle6').style.left= (left_pos + "px");
	document.getElementById('middle7').style.left= (left_pos + "px"); 
	document.getElementById('middle8').style.left= (left_pos + "px");
	document.getElementById('middle9').style.left= (left_pos + "px");
	document.getElementById('middle10').style.left= (left_pos + "px");
	document.getElementById('middle11').style.left= (left_pos + "px");
	document.getElementById('middle12').style.left= (left_pos + "px");
	document.getElementById('middle13').style.left= (left_pos + "px");
	document.getElementById('middle14').style.left= (left_pos + "px");
	document.getElementById('middle15').style.left= (left_pos + "px");
	document.getElementById('middle16').style.left= (left_pos + "px");
	document.getElementById('middle17').style.left= (left_pos + "px");
	document.getElementById('middle18').style.left= (left_pos + "px");
	document.getElementById('middle19').style.left= (left_pos + "px");
	document.getElementById('middle20').style.left= (left_pos + "px");
	document.getElementById('middle21').style.left= (left_pos + "px");
	document.getElementById('middle22').style.left= (left_pos + "px");
	document.getElementById('middle23').style.left= (left_pos + "px");
	document.getElementById('middle24').style.left= (left_pos + "px");
}

function scrolldown()
{window.scrollBy(200,760);
}