password show in * form..

For validation i Suggest make use of RegularExpressions and for this support also available in client side javascript.

Example code :


function validateForm(){
     var nameRegex = /^[a-zA-Z]+$/; var validfirstUsername =   
    document.frm.userName.value.match(nameRegex);
     if(validUsername == null)
     {
            alert("Your username name is not valid. Only characters A-Z, a-z are acceptable.");           
            document.frm.userName.focus();
           return false;
     }
 }