function checksearch(form){
	if(form.keyword.value==""){
		alert("请填写搜索关键字!");
		form.keyword.focus();
		return false;
	}

	for(i=0;i<form.stype.length;i++){  
		if(form.stype[i].checked==true){
			stype_value=form.stype[i].value;	
		}
	}
	switch(stype_value){
		case "sell":
			form.action="http://www.ADGIC.com/search/search_sell.asp";
			break;
		case "buy": 
			form.action="http://www.ADGIC.com/search/search_buy.asp";
			break;
		case "company": 
			form.action="http://www.ADGIC.com/search/search_company.asp";
			break;	
		case "article":
			form.action="http://www.ADGIC.com/search/searchnews.asp"; 
	} 
	if (stype_value=="sell"){
		if(form.keyword.value.length<3){
			alert("搜索关键字不可小于3个字符!");
			form.keyword.focus();
			return false;	
		}  
	}
	if (stype_value=="pdf"){
		window.open("http://www.ADGIC.com/search/searchdatasheet.asp?Searchword="+form.keyword.value);
		return false;
	}  
	return true;  
}