Using External Font is very Easy
1.Download the font
2.If the Downloaded font is in ttf format convert it into eot format by a tool which you have to search and download or use this online convertor http://www.kirsle.net/wizards/ttf2eot.cgi
3.If the Downloaded file is in otf format convert it into ttf format and then convert it into eot
4. Both ttf and eot is need. ttf is supported by most browser but IE didn’t support ttf so we need eot format
5.In your css just do the follwing