password validation with special character

password validation with numeric ,character and special character ;
<script type="text/javascript" language="javascript">

function validation()
{

    var a=document.form.fnm.value;
    var b=document.form.mnm.value;
    var c=document.form.mnm.value;
    var d=document.form.pass.value;
    var e=document.form.cpass.value;
     if(a=="")
     {  
       alert("Plz Enter Name");

     } 
     else if(!isNaN(form.fnm.value))
     {
        alert("Plz Enter character"); 
     }
     else if(a.length<5 || a.length>20)
     {
         alert("Plz Enter  min 5 and max 20 character"); 
     }
     else if(b=="")
     {  
       alert("Plz Enter Middle Name");

     } 
     else if(!isNaN(form.mnm.value))
     {
        alert("Plz Enter character"); 
     }
     else if(b.length<5 || b.length>20)
     {
         alert("Plz Enter  min 5 and max 20 character"); 
     }
     else if(c=="")
     {  
       alert("Plz Enter Middle Name");

     } 
     else if(!isNaN(form.lnm.value))
     {
        alert("Plz Enter character"); 
     }
     else if(c.length<5 || c.length>20)
     {
         alert("Plz Enter  min 5 and max 20 character"); 
     }
     else if(!(d==e))
      {
          alert(" not match")       
      }


      else if(d)

      {
          var filter1 = /[a-zA-Z]/g;
          var filter2 = /[@$,<>#:?_*&;]/g;
          var filter3 = /[0-9]/g;
           if (d.match(filter1) && d.match(filter2) && d.match(filter1) && d.match(filter3)) {
        alert("valid");

    } 
        else
        {
            alert("invalid");
        }

      }

      else 
      {
           var email = document.getElementById('txtEmail');
    var filter = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;

    if (!filter.test(email.value)) {
    alert('Please provide a valid email address');
    email.focus;
    return false;         
      }
      }
}

</script>


 <form method="post" name="form" action="">
   <table align="center" border="2">
     (mendetary field *)
     <tr>
       <td>First name*</td>
       <td><input type="text" name="fnm"></td>
       </tr>
       <tr>
       <td>Middle name*</td>
    <td><input type="text" name="mnm"></td>
     </tr>
     <tr>
       <td>Last name*</td>
    <td><input type="text" name="lnm"></td>
     </tr>
     <tr>
       <td>Password*</td>
    <td><input type="password" name="pass"></td>
     </tr>
     <tr>
       <td>Confirm Password</td>
    <td><input type="password" name="cpass"></td>
     </tr>
     <tr>
       <td>Mobile No.*</td>
    <td><input type="text" name="mno"></td>
     </tr>
     <tr>
       <td>Tele Phone No.*</td>
    <td><input type="text" name="tno"></td>
     </tr>

     <tr>
       <td>Email ID*</td>
    <td><input type="text" name="email" id="txtEmail"></td>
     </tr>
     <tr>
    <td>Gender</td>
    <td><input type="radio" name="rad">MALE*


    <input type="radio" name="rad">Female* </td>
     </tr>

     <tr>
       <td>Select Country*</td>
    <td><select name="country">
    <option value=""></option>
    <option value="india">india</option>
    <option value="pakistan">pakistan</option>
    <option value="shrilanka">shrilanka</option>
    <option value="america">america</option>
    <option value="japan">japan</option>
    <option value="china">china</option>
    </select>

    </td>
     </tr>
     <tr>
       <td>Address*</td>
    <td><input type="textarea" name="txtarea"></td>
     </tr>
     <tr>
       <td>Pin Code*</td>
    <td><input type="text" name="pcode"></td>
     </tr>
     <tr>

    <td><input type="checkbox" name="chk">plz check </td>
     </tr>
     <tr>

    <td align="center" colspan="2"><input type="submit" name="btnsub" value="submit" onclick="validation()"></td>
     </tr>
   </table>
 </form> 
 <div id="fnm1" style="display:none">
 <font size="+1" color="#FF0000"> pLz enter name
 </div>