function picpos()
{
var wid = document.body.clientWidth;
	var left_pos1 = parseInt(wid - 540)/2;
	var left_pos2 = parseInt(wid - 360)/2;
	var left_pos3 = parseInt(wid - 750)/2;
		
	
	document.getElementById('wm1').style.left = (left_pos1 + "px");
	document.getElementById('wm2').style.left = (left_pos2 + "px");
	document.getElementById('centre').style.left = (left_pos3 + "px");
	
	 reveal();}
	 function reveal()
	 {
	document.getElementById('wm1').style.visibility = "visible";
	document.getElementById('wm2').style.visibility = "visible";
	}