How to get current category id in product detail page

Sometimes we need current category id or other stuff in product detail page.
We can get current category id in product detail page by :
$this->getProduct()->getCategory()->getEntityId();

What should we do if we need to create menu navigation with product attributes??

<?php  ?>
<li><a href="<? echo $this->getUrl();?>designer"><span>Designer</span></a>
<ul class="designer">
<li class="first designer_section"><h4>Men's Designer</h4>
<span class="designer_section">
<?php
$product = Mage::getModel('catalog/product');

// load a product collection filtered by desginersex
$productCollection = $product->getCollection()
//->distinct(true)
//->addAttributeToSelect('designername')
->addAttributeToSelect('*')
->addAttributeToFilter('designersex', 128)
->load();

// process the collection
$i = 0;

foreach ($productCollection as $prod) { 
//print_r($prod->getdesigner());
$designer_name[$i] = $prod->getAttributeText('designer');
$designer_id[$i] = $prod->getdesigner();
$i++;
}
$count = $i -1;

if($count >30)
$count = 30;
$temp = '';
$k = 0;
for($i = 0; $i < $count; $i++)
{
for($j = $i + 1; $j < $count; $j++){ 
if($designer_name[$i] == $designer_name[$j]){
$designer_name[$j] = '';
//$count--;
}
}
}

for($i = 0; $i < $count; $i++)
if($designer_name[$i]!= ''){

echo '<span><a href="'.$this->getUrl().'designer_list?gender=male&designer='.$designer_id[$i].'">'.$designer_name[$i].'</a></span>';
}
?>
</span>
</li> 
<li class="first designer_section"><h4>Women's Designer</h4> 
<span class="designer_section">
<?php
$product = Mage::getModel('catalog/product');

// load a product collection filtered by desginersex
$productCollection = $product->getCollection()
->addAttributeToSelect('*')
->addAttributeToFilter('designersex', 127)
->load();

$i = 0;
foreach ($productCollection as $prod) { 
$designer_name[$i] = $prod->getAttributeText('designer');
$designer_id[$i] = $prod->getdesigner();
$i++;
}
$count = $i;
if($count >30)
$count = 30;
$temp = '';
$k = 0;
for($i = 0; $i < $count; $i++)
{
for($j = $i + 1; $j < $count; $j++){ 
if($designer_name[$i] == $designer_name[$j]){
$designer_name[$j] = '';
//$count--;
}
}
}

for($i = 0; $i < $count; $i++)
if($designer_name[$i]!= '')
echo '<span><a href="'.$this->getUrl().'designer_list?gender=female&designer='.$designer_id[$i].'">'.$designer_name[$i].'</a></span>';
?>
</span>     
</li>
<a style="float:left; color:#fff; font-size:10px; padding-left:20px;" href="<? echo $this->getUrl();?>designer"> View All</a>
</ul>
</li>
<?php  ?>

How to add static block in magento

First we need to create a static block from admin panel.

Then we shall write what we need. Remember, We need to input the identifier value, which will represent the block by BlockId.

Displaying Product's Filter attributes in breadcrumbs.

This is a wonder, why Magento does not allow displaying product's Filter attributes in breadcrumbs.
Thats why I need to create custom code.
Here is the way:

<?php if($crumbs && is_array($crumbs)): ?>
<?php
$current_url = $this->helper('core/url')->getCurrentUrl();
$link_pass = strpos($current_url, '?');
?>
<div class="breadcrumbs">

<ul>

<?php foreach($crumbs as $_crumbName=>$_crumbInfo): ?>

<li class="<?php echo $_crumbName ?>">

<?php if($_crumbInfo['link']): ?>

<a href="<?php echo $_crumbInfo['link'] ?>" title="<?php echo $this->htmlEscape($_crumbInfo['title']) ?>"><?php echo $this->htmlEscape($_crumbInfo['label']) ?></a>

<?php elseif($_crumbInfo['last']): ?>
<?php if($link_pass){ ?><a href="<?php echo $_crumbInfo['link'] ?>" title="<?php echo $this->htmlEscape($_crumbInfo['title']) ?>"><?php }?>
<?php echo $this->htmlEscape($_crumbInfo['label']) ?>
<?php if($link_pass){ ?></a><?php }?>
<?php else: ?>

<?php echo $this->htmlEscape($_crumbInfo['label']) ?>

<?php endif; ?>


</li>

<?php endforeach; ?>

<?php 
if($link_pass){
$final_filter = '';
$pass = 0;
$filter_link = explode("?", $current_url); 
$filter_link = $filter_link[1];
$filter_attr = explode("&",$filter_link);
$filter_len = count($filter_attr);
?>
<li>
<?php 
if(Mage::app()->getRequest()->getParam('cat')){
$id = Mage::app()->getRequest()->getParam('cat');
$_category = Mage::getModel('catalog/category')->load($id);
$cat_url = Mage::getModel("catalog/category")->load($id)->getUrl();
$cat_name = $_category->getName(); 
if($filter_len > 1) { ?>
<a href="<?php echo $cat_url; ?>" style="margin-right:4px;">
<?php } ?>
<?php echo $cat_name; ?>
<?php if(count($filter_link) != 0) { ?>
</a>
<?php } 
}
?>
</li>
<?php
for($i = 0; $i < $filter_len; $i++)
{
$filter_pos = strpos($filter_attr[$i], '=');
$filter_attr1 = substr($filter_attr[$i], 0, $filter_pos);
if( $filter_attr1 != 'cat'){
$filter_attr1 = '<b style="text-transform:capitalize;">'.str_replace("_", " ", $filter_attr1).'</b>';
$final_filter =  $final_filter .", ".$filter_attr1;
$pass = 1;
} 
}
if($pass)    
echo "<li> [".substr($final_filter, 2, strlen($final_filter))." ]</li>";

}
?>
</ul>
</div>

<?php endif; ?>

Everything is done in breadcrumbs.phtml file.