Problem mit Object

function gradeit(){
var incorrect=null
for (q=1;q<=totalquestions;q++){
	var thequestion= new Array()
	thequestion=eval("document.myquiz.question"+q)
		for (c=0;c<thequestion.length;c++){ //Hier liegt der Fehler

			document.write("test")
		if (thequestion[c].checked==true)
		actualchoices[q]=thequestion[c].value
		}

	if (actualchoices[q]!=correctchoices[q]){ //process an incorrect choice
		if (incorrect==null)
		incorrect=q
		else
		incorrect+="/"+q
		}
	}


if (incorrect==null)
incorrect="a/b"
document.cookie='q='+incorrect
if (document.cookie=='')
alert("Your browser does not accept cookies. Please adjust your browser settings.")
else
window.location="results.htm"
}

function ShowContent(MyID) {
      	if (MyID == "0") {
      	  document.getElementById("5").data = "content/start.html";
      	}
      	if (MyID == "1") {
      	  document.getElementById(5).data = "content/primzahlen.html";
      	}
      	if (MyID == "2") {
      	  document.getElementById(5).data = "content/zeit.html";
      	}
      	if (MyID == "3") {
      	  document.getElementById(5).data = "content/sortierung.html";
      	}
      	if (MyID == "4") {
      	  document.getElementById(5).data = "content/matrizen.html";
      	}
      }