function validate_email(field,alerttxt){
	with (field)
	{
	apos=value.indexOf("@")
	dotpos=value.lastIndexOf(".")
	if (apos<1||dotpos-apos<2) 
	  {alert(alerttxt);return false}
	else {return true}
	}
	}
	function validate_form(thisform)
	{
	with (thisform)
	{
	if (validate_email(email,"'.$lang_notvalidemail.'")==false)
	  {email.focus();return false}
	}
	}