[Seasar-user:10969] disable a button

[=?GB2312?B?wO7A1g==?=]

Can i disable a button dynamically ?

Where's the problem with my code?

    public String getSelectAllDisabled() {
        if (viewItems == null || viewItems.length == 0) {
            return "disabled";
        } else {
            return "false";
        }
    }

<input id="selectAll" type="button" value="¤¹¤Ù¤Æßx’k" class="button large"
style=""  disabled=""/>
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