function validate_email(field,alerttxt)
{
with (field)
	{ 
	apos=value.indexOf("@");
	dotpos=value.lastIndexOf(".");
	if(apost<1||dotpost-apost<2)
		{alert(alerttxt);return false;}
	else {return true;}
	}

}

function validate_form(thisform)
{
with (thisform)
	{
	if (validate_email(email, "Not a valid e-mail adress!")==false)
		{email.focus(); return false;}
	}
}