출처  : http://blog.dbza.net/15




function createForm(nm,mt,at,tg) {
	var f=document.createElement("form");
	f.name=nm;
	f.method=mt;
	f.action=at;
	f.target=tg;
	return f;
}

function addHidden(f,n,v) {
	var i=document.createElement("input");
	i.type="hidden";
	i.name=n;
	i.value=v;
	f.insertBefore(i);
	return f;
}

var frm=createForm("폼이름", "폼method", "URL", "_self");
frm=addHidden(frm, "폼name", "폼value");
.
.
.
document.insertBefore(frm);
frm.submit();