function validate_required(field,alerttxt)
{
with (field)
{
  if (value==null||value==""||value=="Your Name"||value=="Your Phone Number"||value=="Your Email Address")
  {
  alert(alerttxt);return false;
  }
  else
  {
  return true;
  }
}
}

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 check_form(thisform)
{
with (thisform)
{
if (validate_required(name,"Please fill out your name!")==false)
  {name.focus();return false}
if (validate_required(phone,"Please fill out your phone number!")==false)
  {phone.focus();return false}  
if (validate_required(email,"Email must be filled out!")==false)
  {email.focus();return false}
if (validate_email(email,"Not a valid e-mail address!")==false)
  {email.focus();return false}
}
}