var newwindow;
function popup(url,width,height,name,scrollbars)
{
	newwindow=window.open(url,''+name+'','scrollbars='+scrollbars+',height='+height+',width='+width+',top=' + (screen.height-height)/2 + ',left=' + (screen.width-width)/2);
	if (window.focus) {
		newwindow.focus()
	}
}