Question : Javascript question on populating required field

I have this javascript.. however it is not sisplaying alerttxt parameter even though it is true

function validate_required(field,alerttxt1,alerttxt)
{
with (field)
  {
  if (value=null)
    {
    alert(alerttxt1);return false;
    }
  else
    {
    alert(alerttxt);
    return true;
    }

Answer : Javascript question on populating required field 

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<script>
function validate_required(field,alerttxt1,alerttxt)
{
//with (field) comment this out
  {
  if (field.value==null || field.value=="")
    {
       alert(alerttxt1);
	   return false;
    }
  else
    {
    alert(alerttxt);
    return true;
    }
  }
}

  </script>
 </HEAD>

 <BODY>
  <input type='text' id='name' value='aaa'>
  <input type='button' value='button' onclick="validate_required(document.getElementById('name'),'please enetr text',document.getElementById('name').value)">
 </BODY>
</HTML>
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