document.write("<table width='440'   cellpadding='0'><form id='form1' name='form1' method='post' action='/login.aspx'>");
document.write("<tr><td width='115' height='18'>登陆名：<input name='txtUserName' type='text' maxlength='20' onclick='ChkForm2(this.form)'  style='width: 50px;height:16px;border:1px solid #aaaaaa' /></td>");
document.write("<td width='95' height='18'>密码：<input name='txtPassword' type='Password' maxlength='20' onclick='ChkForm3(this.form)'  style='width: 50px;height:16px;border:1px solid #aaaaaa' /></td>");
document.write("<td width='90' height='18'><input name='txtValidateKey' value='验证码' onclick='ChkForm4(this.form)'  type='text' maxlength='4' style='width: 40px;height:16px;border:1px solid #aaaaaa' />&nbsp;<img src='/commn/validatekey.aspx' align='absmiddle'></td>");
document.write("<td width='50 height='18' align='right'><select  name='lstUserType' style='width:50px;height:16px;border:1px solid #aaaaaa'><option selected='selected' value='2'>个人</option><option value='1'>企业</option><option value='3'>明星</option></select></td><td width='90' height='23'>");
document.write("<input name='LastUrl' value='' type='hidden' /><input id='Submit1' type='submit' value='登 录' onClick='return ChkForm(this.form)' style='width: 40px;height:20px;border:1px solid #aaaaaa' />&nbsp;<a href=/commn/reg.asp><b>注册</b></a>");
document.write("</td></tr></form></table>");

     function ChkForm(frm)
    {
       if(frm.txtUserName.value==""||frm.txtPassword.value=="")
       {
          alert("用户名和密码都不能为空！");
          return false;
       }
       
       var reg=/['<> \"]+/;
       if(reg.test(frm.txtUserName.value))
       {
          alert("用户名不能包含特殊字符！");
          return false;
       }
       
       if(reg.test(frm.txtPassword.value))
       {
          alert("用户密码不能包含特殊字符！");   
          return false;
       }
       

       reg=/^\d{4}$/;
       if(!reg.test(frm.txtValidateKey.value))
       {
          alert("验证码只能是数字,且是四位数！");
          return false;
       }
       
       return true;    
    }

   function ChkForm2(frm1)
    {
       if(frm1.txtUserName.value=="登陆名")
       {
          frm1.txtUserName.value="";
       }
    }
   
     function ChkForm3(frm2)
    {
       if(frm2.txtPassword.value=="密码")
       {
          frm2.txtPassword.value="";
       }
    }  
    
     function ChkForm4(frm3)
    {
       if(frm3.txtValidateKey.value=="验证码")
       {
          frm3.txtValidateKey.value="";
       }
    }