function searchcheck(){

	if(search.keyword.value.length<2){
		alert("请填写最少2个字后再提交！");
		search.keyword.focus();
		return false;
	} else if (search.keyword.value=='瑞星杀毒软件2006版'||search.keyword.value=='现在购买只需10元') {
		window.open("http://reg.rising.com.cn/ap/ap01/index_ad.asp?lid=rising&uid=A7Y97YY6Y85D1CR5&aid=11388134");
		return false;
	}else if(search.platformid.value=="-1"){
		var theurl="http://search2.enet.com.cn/Search?d_channel=eschool&d_site=article&act=2&d_keyword="+search.keyword.value;
		search.action=theurl;
		
	}
	else{
		search.action="/search.php";
	}
	return true;

}