function zchecksearch(the_form){
  if(the_form.key.value==""){
      alert("搜索关键词不能为空！");
      the_form.key.focus();
      return false;
  }
  if(the_form.key.value=="请输入关键词..."){
      alert("搜索关键词不能为空！");
      the_form.key.focus();
      return false;
  }
    return true;
}
function setvalue(){
	var val = document.getelementbyid("key_w");
	if(val.value=="请输入关键词..."){
		document.getelementbyid("key_w").style.color = "#000";
		document.getelementbyid("key_w").value = "";
		return;
	}
	if(val.value==""){
		document.getelementbyid("key_w").style.color = "#ccc";
		val.value = "请输入关键词...";
		return;
	}
}