//זה במאסטר פייג
  <script type="text/javascript">
    function isEmpty(str)
    {
    return (str.length==0);
    }

    function isValidString(str)
    {
        var badCharStr="$%^&*()_+[]{}<>&";
        for (var i=0;i<str.length;i++)
        {
            for (var j=0;j<badCharStr.length;j++)
            {
                if (str.charAt(i)==badCharStr.charAt(j))
                     return false;
            }
        }
        if (str.indexOf("\"")!=-1)
            return false;
        return true;
    }

    function isValidNumber(str) {
        for (var i = 0; i < str.length; i++) {
            if ((str.charAt(i) > '9') || (str.charAt(i) < '0'))
                return false;
        }
        return true;
    }

    function isEmail(str)
    {

    if ((str.split("@").length==2)&&
       (str.indexOf("@")!=0)&&
       (str.indexOf(".")!=0)&&
       (str.lastIndexOf(".") != str.length - 1) &&
       (str.indexOf(".")!=-1)&&
       (str.length>=5) && (str.length<=30))
           return true;
    else
       return false;
    }

    </script>


//זה ברגיסטר
<script type="text/javascript">
function checkForm()
{
var msg="";
if (isEmpty(document.getElementById("uname").value))
{
    msg += "you must enter username\n";
}
else
{
    if (!(isValidString(document.getElementById("uname").value)))
    {
        msg += "you must enter valid characters in user name\n";
    }
}

      if (isEmpty(document.getElementById("fname").value))
     {
     msg+="you must enter first-name\n";
     }
 else {
     if (!(isValidString(document.getElementById("fname").value))) {
         msg += "you must enter valid characters in first name\n";
     }
 }

      if (isEmpty(document.getElementById("lname").value))
     {
     msg+="you must enter last-name\n";
     }
 else {
     if (!(isValidString(document.getElementById("lname").value))) {
         msg += "you must enter valid characters in last name\n";
     }
 }
      if (isEmpty(document.getElementById("id").value))
     {
     msg+="you must enter id\n";
     }
 else {

     if (!(isValidNumber(document.getElementById("id").value)))
     {
     msg+="id must be only numbers\n";
     }
 }
      if (isEmpty(document.getElementById("email").value))
     {
     msg+="you must enter email\n";
     }
 else
 {
      if (!isEmail(document.getElementById("email").value))
      {
          msg+="you must enter a valid email adress\n";
      }

  }
      if (isEmpty(document.getElementById("age").value))
     {
     msg+="you must enter age\n";
     }
 else {
     if (!(isValidNumber(document.getElementById("age").value))) {
         msg += "you must enter a number in age\n";
     }
 }
     if (isEmpty(document.getElementById("city").value))
     {
     msg+="you must enter city\n";
     }

     if (isEmpty(document.getElementById("gender").value))
     {
     msg+="you must enter gender\n";
     }

     if (isEmpty(document.getElementById("pass").value))
     {
     msg+="you must enter password\n";
     }

     if (isEmpty(document.getElementById("repass").value))
     {
     msg+="you must repeat password\n";
     }
     else
     {
     if ((document.getElementById("pass").value)!=(document.getElementById("repass").value))
     {
     msg+="passwords are not the same\n";
     }
     }
     if (msg.length!=0)
     {
          alert(msg);
          return false;
     }
 return true;
}

</script>