function OnTop() {
	window.scroll(0, 0);
}

function OpenWindow(file,width,height)
{
	var width  = width ? width : 640;
	var height = width ? width : 550;
	var x = (screen.width - width)/2;
	var y = (screen.height - width)/2;
	window.open(
		file, 'dialog', 'left=' + x + ', top=' + y + ', width=' + width + ', height=' + height + ', ' +
		'menubar=no, resizable=yes, scrollbars=no, status=yes, titlebar=yes, toolbar=no, help=no'
	);
}