ボタン連打制御

<form onsubmit="return submittableObject_Click();">

<input type="submit" value="送信">

             ^^^^^^

こんな感じ
onclick = new function(onclick.toString() + "追加する内容");

      document.forms[0].elements[i].onclick = new Function (
      	"submittableObject_Click();"+
      	"document.forms[0].elements["+i+"].onclick();");

--作成
function Func(execFunc) {
    this.exec = function () {
        submittableObject_Click();
        execFunc.call();
    }
}

--document.forms[0].elements[i].onclick = submittableObject_Click;のかわり
var func = new Func(document.forms[0].elements[i].onclick);
document.forms[0].elements[i].onclick = func.exec;

      var fuc = document.forms[0].elements[i].onclick;
      document.forms[0].elements[i].onclick = submittableObject_Click;
      document.forms[0].elements[i].attachEvent("onclick",fuc);

(略).onclick = new Function( "go();" + "submittableObject_Click();");

    (略).onclick = new Function(

      	"submittableObject_ClickVer2(" + variableFunc + ");"

      	);





// 二重送信制御（関数オブジェクトを引数に取るバージョン)

function submittableObject_ClickVer2(funcObject) {

  if (isDocumentLoading()) {

    alert("処理中です…");

    return false;

  }

  //引数で指定された関数を実行

  funcObject();



  alert("submitを実行します");

  return true;

}