var win = null;

function popUpWindow(mypage, myname, w, h, scroll){
	LeftPosition = (screen.width) ? (screen.width-w)/2 : 0;
	TopPosition = (screen.height) ? (screen.height-h)/2 : 0;
	
	settings = 'height='+h+', width='+w+', top='+TopPosition+', left='+LeftPosition+', scrollbars='+scroll+', resizable';
	
	win = window.open(mypage, myname, settings);
}