function checkonlinebuy(){
	if(document.onlinebuy.oy_company.value==""){
		alert(document.onlinebuy.oy_company.title);
		document.onlinebuy.oy_company.focus();
		
		return false;
	}
	if(document.onlinebuy.oy_phone.value==""){
		alert(document.onlinebuy.oy_phone.title);
		document.onlinebuy.oy_phone.focus();
		return false;
	}
	if(document.onlinebuy.oy_name.value==""){
		alert(document.onlinebuy.oy_name.title);
		document.onlinebuy.oy_name.focus();
		return false;
	}

	if(document.onlinebuy.oy_product.value==""){
		alert("请选择要购买的产品");
		return false;
	}

}