function limit(ta,n)
{
 var s = ta.value;
 ta.value = s.substring(0,n-1);
 return false;
}

function checkall() {

  var err_message = "";  
  var content_e = document.contactform.email;


  if ( 
       content_e.value.length < 6 || 
       content_e.value.indexOf('@') == -1 ||
       content_e.value.indexOf('.') == -1
     ) 
  {
    
    err_message += "You must enter a valid email address.\n"; 
  } 
 

  if ( err_message == "" ) {
     return true;
  }  
  else
  { 
     alert(err_message);
     return false;
  }
}

function submitform() {

document.contactform.submit();

}