def asset_exists?(asset_type, asset_path)
      File.exists?(Merb.root / asset_path(asset_type, asset_path, true))
    end
def asset_exists?(asset_type, asset_path)
      File.exists?(Merb.root / asset_path(asset_type, asset_path, true))
    end
==== Parameters
 asset_type<Symbol>: A symbol representing the type of the asset.
 asset_path<String>: The path to the asset

 ==== Returns
 exists?<Boolean>

 ==== Examples
 This tests whether a give asset exists in the file system.