PHPChina表单验证

<script language="javascript">
function check() {    
var name = document.form1.name.value,
tel = document.form1.phone.value,    
age = document.form1.age.value,    
qq = document.form1.qq.value,
email = document.form1.mail.value;    
    if(name=="") {    
        alert("姓名为必填!");    
        document.form1.name.focus();
        return false;    
    }
    if (name.replace(/[^\x00-\xff]/g, "**").length > 8 || name.replace(/[^\x00-\xff]/g, "**").length <4 ){        
        alert("请认真填写您的姓名!");    
        document.form1.name.focus();
        return false;    
    }    
    if(age=='') {
        alert("请填写年龄");
        document.form1.age.focus();    
        return false;    
    }
    if(isNaN(age) || age>40 || age<10) {
        alert("请认真填写年龄");
        document.form1.age.focus();    
        return false;    
    }    
    if(tel==""){    
        alert("联系方式为必填!");    
        document.form1.phone.focus();
        return false;    
    }    
    if (isNaN(tel) || tel.replace(/[^\x00-\xff]/g, "**").length > 18 || tel.replace(/[^\x00-\xff]/g, "**").length<8 ) {    
        alert("请认真填写联系方式!");
        document.form1.phone.focus();
        return false;
    }
    if(qq == '') {
        alert("请填写QQ号码");
        document.form1.qq.focus();
        return false;
    }
    if(isNaN(qq) || qq.replace(/[^\x00-\xff]/g, "**").length > 11 || qq.replace(/[^\x00-\xff]/g, "**").length<5  ) {
        alert("请输入合法QQ号码");
        document.form1.qq.focus();
        return false;
    }
        return true;
}
function war() {
    alert ("该功能已关闭开放！");
}
</script>