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//Adding an image from the media folder:
<img src="<?php echo Mage::getBaseUrl(Mage_Core_Model_Store::URL_TYPE_MEDIA). 'subfolder/image.png'; ?>" />
//*note Mage::getBaseUrl(Mage_Core_Model_Store::URL_TYPE_MEDIA) returns a path of www.yourwebsite.com/media

//Another way to produce the same link is:
<img src="<?php echo Mage::getBaseUrl(Mage_Core_Model_Store::URL_TYPE_LINK). 'media/subfolder/image.png'; ?>" />
//*note Mage::getBaseUrl(Mage_Core_Model_Store::URL_TYPE_LINK) returns a path of www.yourwebsite.com

//Adding an image from the skin folder:
<img src="<?php echo $this->getSkinUrl('images/image.png'); ?>" alt="image alt text" />
//*note $this->getSkinUrl returns a path of www.yourwebsite.com/skin/frontend/PACKAGE/THEME

//Media Images from CMS Page

//Adding an image from the media folder:
{{media url='subfolder/image.png'}}
//*note {{media url=”}} returns a path of www.yourwebsite.com/media


//Skin Images from CMS Page

//Adding an image from the skin folder:
{{skin url='images/image.png'}}
//*note {{skin url=”}} returns a path of www.yourwebsite.com/skin/frontend/PACKAGE/THEME


//Echo Media Folder Path
<?php echo $this->getMediaUrl(); ?>
//OR
<?php echo Mage::getBaseUrl(Mage_Core_Model_Store::URL_TYPE_MEDIA); ?>

//Echo Skin Folder Path
<?php echo $this->getSkinUrl(); ?>

//From CMS Pages

//Display Media Folder Path
{{media url=''}}

//Display Skin Folder Path
{{skin url=''}}