function CheckForm(){
  String.prototype.Trim = function(){return this.replace(/^\s+|\s+$/g,"");}
  if(form1.keyword.value.Trim()==""){
    alert("ÇëÊäÈëÄúÒªËÑË÷µÄ¹Ø¼ü×Ö£¡");
	form1.keyword.focus();
    return false;
  }
  return true;
}