function openWindow(htmlfile,windowname,pictWidth,pictHeight) { 
	var winl = (screen.width - pictWidth) / 2;
	var wint = (screen.height - pictHeight) / 2;
	windowfeatures="scrollbars=no,resizable=no,left="+winl+",top="+wint+",width="+pictWidth+",height="+pictHeight;
	window.open(htmlfile,windowname,windowfeatures);
}