No Doctype help

From: Michael Angley <moheganmike@optonline.net> Date: Thu, 05 Nov 2009 14:46:01 -0500 To: www-validator@w3.org Message-id: <04CAB996-2B65-4A81-B41F-8729FCD557EA@optonline.net> · This archive was generated by hypermail 2.2.0+W3C-0.50 : Monday, 7 December 2009 10:57:39 GMT

Please help it should be simple (but not for me). I'm a newbie and  
created Dreamweaver html pages from sliced Photoshop (all CS4). It  
looks okay but when I validated, it said NO DOCTYPE DECLARATION. If I  
knew the Doctype I would just add it to the top in Dreamweaver but I  
don't want to constrain the file. It has Flash. The website is http:// 
www.mjadesign.biz/

If you can tell me which Doctype to use I would be grateful.
Thanks, Mike Angley