Zend_File_Transfer_Adapter_Http Extension Validator

[dme]

I have the next code:\[code\]$currFile = new Zend_File_Transfer_Adapter_Http();$currFile->addValidator('Extension', false, 'jpg');\[/code\]It works pretty. But if I put \[code\]array('jpg','png')\[/code\] instead of \[code\]'jpg'\[/code\], only files with jpg extendion works.How can I set more than 1 extension. Thank you for your help.