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 validateForm(contact)
{

if(""==document.forms.contact.name.value)
{
alert("Please enter your full name.");
return false;
}

if(""==document.forms.contact.email.value)
{
alert("Please enter your email address.");
return false;
}

with (contact)
  {
  if (validate_email(email,"Not a valid e-mail address!")==false)
    {email.focus();return false;}
  }

if(""==document.forms.contact.comments.value)
{
alert("Please enter your comments.");
return false;
}

}