function Isemail(data){
          data=data.toString();
          iLen=data.length;
          var str=data.indexOf("@");
        var strb=data.indexOf(".");
        if ((strb>(str+1)) && (str>=1) && (strb>=4) && (strb<=(iLen-3))) {
                        return true;
        }
            else{
              return false;
                }
        return true;
        }

function IsNumeric(data){
                data=data.toString();
                iLen=data.length;
                for(var i=0; i<iLen; i++) {
                        var ch = data.charAt(i);
            if ((ch < "0" || ch > "9") && ch!=".")
                                return false;
                }
                return true;
        }
function trim(str){
                str=str.toString();
            var i=0;
            var j=str.length-1;
            flagbegin= true;
            flagend= true;
            while  (flagbegin== true){
                if (str.charAt(i)==" "){
                    i=i+1;
                    flagbegin=true;
                }
                else{
                    flagbegin=false;
                }
            }
            while  (flagend==true){
                if (str.charAt(j)==" "){
                    j=j-1;
                    flagend=true;
                }
                else{
                    flagend=false;
                }
            }
            trimstr=str.substring(i,j+1);
            return trimstr;
        }



function checkform(form)
{
        if (form.UserName.value=="")
        {
        alert("“用户名”是必填项！");
        form.UserName.focus();
        return false;
        }

        if ((form.UserName.value.length>8) || (form.UserName.value.length<3))
        {
        alert("“用户名”最多为8个字符！,最少为3个字符");
        form.UserName.focus();
        return false;
        }
        if (form.Password.value=="")
        {
        alert("“密码”是必填项！");
        form.Password.focus();
        return false;
}
        if (form.Password.value == form.UserName.value)
        {
                alert("密码与用户名不能相同！请重新输入");
        form.Password.focus();
                return false;
        }

        if (form.Password.value.length<3)
        {
        alert("“密码”最少要3个字符！");
        form.Password.focus();
        return false;
        }
        if (form.AgainPassword.value=="")
        {
        alert("“确认密码”是必填项！");
        form.AgainPassword.focus();
        return false;
        }
        if (form.AgainPassword.value != form.Password.value)
        {
                alert("你两次输入的密码不一样！请重新输入");
        form.AgainPassword.focus();
                return false;
        }


        if (form.Tel.value=="")
        {
        alert("“联系电话”是必填项！");
        form.Tel.focus();
        return false;
        }
       if (form.Address.value=="")
        {
        alert("“联系地址”是必填项！");
        form.Address.focus();
        return false;
        }

        if (form.Email.value!="")
         {
            if((Isemail(trim(form.Email.value))==false))
            {
                alert(" 输入的“ E-mail ” 无效 !");
                form.Email.focus();
                return false;
        }
        
        if (form.Content.value=="")
        {
        alert("“曾从事经历”是必填项！");
        form.Content.focus();
        return false;
        }
        
        }
}