// JavaScript Document
function lycheck()
{
          if(document.getElementById("gb_name").value=="")
            {
                alert("请输入您的姓名！");
				 document.gbook.gb_name.focus();
                return false;
            }
			if(document.getElementById("gb_name").value.length<2)
            {
                alert("请认真填写您的姓名！");
				document.gbook.gb_name.focus();
                return false;
            }
			if (contain(document.getElementById("gb_name").value,             "0.123456789*/-_—+=&^$#@!~`?|\、‘“”：；《》，。;':%()><"))
			{ 
			alert("姓名只能输入汉字或英文！");
			 document.gbook.gb_name.focus();
			return false;
			}
			
			
			if(document.getElementById("gb_phone").value!="")
				 {
				if(document.getElementById("gb_phone").value.length < 8 || document.getElementById("gb_phone").value.length>=14)
				{
				   alert("错误的电话号码，请重新填写您的电话！");
				    document.gbook.gb_phone.focus();
				   return false;
				}
				else
			   {
				   var phone= document.getElementById("gb_phone").value;
				   var patrn=/^[+]{0,1}(\d){1,3}[ ]?([-]?((\d)|[ ]){1,12})+$/; 
				   if (!patrn.exec(phone)) //检查电话号码是否有效
				   {
					alert("您输入的电话有误！");
					document.gbook.gb_phone.focus();
					 return false;
				   }
			   }
		    }
             
			 if(document.getElementById("gb_email").value!="") 
			 {
				var e_mail= document.getElementById("gb_email").value;
				var pattern =/^([a-zA-Z0-9_-])+@([a-zA-Z0-9_-])+(\.[a-zA-Z0-9_-])+/; 
				if (!pattern.exec(e_mail)) //检查电子邮箱是否有效
               {
                alert("您输入的电子邮箱有误！");
				 document.gbook.gb_email.focus();
                 return false;
               } 
			 }
             
            if(document.getElementById("gb_title").value=="")
            {
                alert("留言主题不能为空！");
				document.gbook.gb_title.focus();
                return false;
            }
           
              if(document.getElementById("gb_content").value=="")
            {
                alert("留言内容不能为空！");
                return false;
            }
            if(document.getElementById("verifycode").value=="")
            {
                alert("验证码不允许为空！");
				 document.gbook.verifycode.focus();
                return false;
            }
            
}

function contain(str,charset)// 字符串包含测试函数
{ 
var i;
for(i=0;i<charset.length;i++)
if(str.indexOf(charset.charAt(i))>=0)
return true;
return false;
}