function checkMail(x)
{
	var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	return (filter.test(x));
}

function popupwindow(url, width, height, wname)
{
	woption='height='+height+',width='+width+',toolbar=no,menubar=no,location=no';
	newwindow=window.open(url,wname,woption);
}