function buttondown( buttonname )
{
 if(document.images) {
  document.images[buttonname].src = eval( buttonname + "Down.src" );
 }
}

function buttonup ( buttonname )
{
 if(document.images) {
  document.images[buttonname].src = eval( buttonname + "Up.src" );
 }
}

function openCenteredWindow(page,win,w,h) {

	var myWin = null;

	leftPos = (screen.width) ? ((screen.availWidth-30)-w)/2 : 0;
	topPos = (screen.height) ? ((screen.availHeight-30)-h)/2 : 0;

	settings="'resizable=1,scrollbars=1,height="+h+",width="+w+",left="+leftPos+",top="+topPos+",screenX="+leftPos+",screenY="+topPos+"', status=yes";
	myWin = window.open(page,win,settings);
}

function copy(e) {

	var message="Sorry, that function is disabled.\nCopy and images Copyright © National D-Day Memorial Foundation.  All rights reserved.\nOur work is not public domain and should not be taken from this site.";

	if (document.all) {
		if (event.button == 2) {
			alert(message);
			return false;	
		}
	}

	if (document.layers) {
		if (e.which == 3) {
		alert(message);
		return false;
		}
	}
}