if (document.getElementsByTagName) { 
    var inputElements = document.getElementsByTagName("input"); 
    for (i=0; inputElements[i]; i++) { 
        if (inputElements[i].className && (inputElements[i].className.indexOf("disableAutoComplete") != -1)) { 
            inputElements[i].setAttribute("autocomplete","off"); 
        }//if current input element has the disableAutoComplete class set. 
    }//loop thru input elements 
}//basic DOM-happiness-check