Here,simple script to get base url, store url, media url, skin url in magento.You can use this method in your static blocks in magento.
1- Base URL
{{base url='yourstore/yourpage.phtml'}}
2- Get Store URL
{{store url='yourpage.phtml'}}
3- Get Skin URL
{{skin url='images/image.png'}}
4- Get Media URL
{{media url='/image.png'}}