Toggle Visibility - Show/Hide use in javascript

<script type="text/javascript">
<!--
    function toggle_visibility(id) {
       var e = document.getElementById(id);
       if(e.style.display == 'block')
          e.style.display = 'none';
       else
          e.style.display = 'block';
    }
//-->
</script>

==============================HTML============================

 <div class="test" onclick="toggle_visibility('testId');" >Click Me</div>

<div id="testId">

Demo text

</div>

Product collection filter by attribute value

$productCollection = Mage::getModel('catalog/product')->getCollection();

 $productCollection->addAttributeToFilter('color', 4);

For example   attribute code  ="color"
                           Red (value id) ="4"

Edit the address in account dashboard in magento


Please follow the steps:-

system > config > (customers) customer configuration > address