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howto add animated gif when fetching folders from server ? It is possile?

Which component do you mean?
For both dhtmlxtree and dhtlmxgrid onXLE and onXLS events can be used to show|hide any kind of loading message.

Please check
    http://www.dhtmlx.com/docs/products/kb/index.shtml?cat=search&q=948&ssr=yes&s=onXLS
    http://www.dhtmlx.com/docs/products/kb/index.shtml?cat=search&q=2137&ssr=yes&s=onXLS