My problem has soled!
ok, Afetr 2 days crawling in jqGrid, I solved the problem via just one changes!
in the jqModal.js, line 61 (in version 3.4.1) you can see some definition for IE6 like this:
var s=0,H=$.jqm.hash,A=[],ie6=$.browser.msie&&($.browser.version == “6.0”),F=false,
I just said that check it fir browser >= 6.0 🙂
($.browser.version >= “6.0”)
and now, it’s work correctly with the same DOCTYPE that I need.
I hope that it’s useful for you…