function central()
{
var wid = document.body.clientWidth;
	var left_pos = parseInt(wid - 842)/2;
	
 
	document.getElementById('middle1').style.left = (left_pos + "px");
	document.getElementById('middle2').style.left= (left_pos + "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('middle1').style.visibility = "visible";
	document.getElementById('middle2').style.visibility = "visible";
	document.getElementById('middle3').style.visibility = "visible";
	document.getElementById('middle4').style.visibility = "visible";
	document.getElementById('middle5').style.visibility = "visible";
	document.getElementById('middle6').style.visibility = "visible";
	document.getElementById('middle7').style.visibility = "visible";
	
}
function scrolldown()
{window.scrollBy(200,760);
}