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Validation problem

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Still getting to gribs with javascript. I've tried a basic form validation but I can't seem to get what I'm doing to work. Anyone point out where I'm going wrong?

   <script type="text/JavaScript">
   function validate_this(){
     valid= true;
     if( document.signup.name.value == "" ){
       alert ( "Please input your name");
        valid= false;
     if( document.signup.age.value == "" ){
       alert ("Please input your age");
       valid= false;
    return valid;  

   <body bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
   <form name="signup" method="POST" action="signup.php" onSubmit="return validate_form ( );">
    <p>Name: <input type="text" name="name"></p>
    <p>Age: <input type="text" name="age"></p>
    <p><input type="submit" value="submit">  


Cheers for any help. [img src=\"style_emoticons/[#EMO_DIR#]/smile.gif\" style=\"vertical-align:middle\" emoid=\":smile:\" border=\"0\" alt=\"smile.gif\" /]

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