how i set disable for all input box in page

i have many input box in my page i want to set disable it.....how i do?
thanks

DOCUMENT.ALL WILL GIV EYOU ARRAY OF OBJECTS ON SCREEN

ITERATE IT AND LOOK FOR THE TYPE BY CALLING TYPE FUNCTION

WHERE EVEREVER YOU GET TYPE="TEXT" DISABLE IT

Have some any example? I don't understand it all becoz i just to started javascript... thanks