title: How to set default value for form fields- Magento?
body: <p>I have an admin form field(textbox),</p>
  
  <pre><code>$fieldset-&gt;addField('ajax_time_interval', 'text', array(
            'label'     =&gt; Mage::helper('dealroom')-&gt;__('Page Refresh Time Interval'),
            'class'     =&gt; 'required-entry',
            'required'  =&gt; true,
            'name'      =&gt; 'ajax_time_interval',
        ));
  </code></pre>
  
  <p>I need to set a default value for this text field. I tried, setting 'value' => '120', in it. But its not working.</p>
  
  <pre><code>$fieldset-&gt;addField('ajax_time_interval', 'text', array(
            'label'     =&gt; Mage::helper('dealroom')-&gt;__('Page Refresh Time Interval'),
            'class'     =&gt; 'required-entry',
            'required'  =&gt; true,
            'name'      =&gt; 'ajax_time_interval',
            'value'     =&gt; '120', 
        ));
  </code></pre>
  
  <p>How to set a defalt value in that field?</p>