function FormFieldOnkeydown(theField) {
  if(window.event.keyCode == 13) //按回车键
    theField.onclick();
}
<!-- 检测表单参数值是否有意义，并且是否为空 -->
function checkString (theField, pErrStr) {
  if(theField==null)  return true;
  if(isWhitespace(theField.value))
    return warnEmpty(theField, pErrStr);
  else 
    return true;
}
function isWhitespace(s) {
  if(isEmpty(s))  return true;
  
  var whitespace=" /t/n/r";   
  var i;
  for(i=0;i<s.length;i++) {
    var c = s.charAt(i);
    if(whitespace.indexOf(c)!=-1)
      continue;
    else
      return false;
  }
  return true;
}
function isEmpty(s) {
  return ((s==null)||(s.length==0));
}
function warnEmpty(theField, strErr) {
  alert(strErr);
  theField.focus();
  return false;
}
function OpenWindow(page, size) {
  window.open(page,"newuser","toolbar=no,location=no,directories=no,status=no,menubar=yes,scrollbars=yes,resizable=no," + size);
}

function DispLogin() {
  var o = parent.document.getElementById("news_login");
  if (o){
	var s = document.body.innerHTML;
	s = s.replace(/\t/,"");
	o.innerHTML= s;
  } else {
  }
}