function kepablak(url, width, height)
{
	if(width == 0) width = screen.width - 80;
	if(height == 0) height = screen.height - 80;
	a_top = Math.floor((screen.height - height)/2);
	a_left = Math.floor((screen.width - width)/2);
	mywindow=window.open(url,'','toolbar=0, location=0, directories=0, status=0, menubar=0, scrollbars=1, resizable=1, titlebar=0, width='+width+', height='+height+', top='+a_top+', left='+a_left);
}