form_name = 変数
document.form_name.submit();
だとerror
変数入れるときは
form_name = 変数
document.forms[form_name].submit();
reference以外に頼ると、eval使ったり（非推奨）などいろんなやり方出てくるが
日本語だとこの書き方あんま出てこないからmemo。
- [reference(]http://www.w3schools.com/jsref/coll_doc_forms.asp)
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