Inserting Digital signature into Listbox

Hello All,

what I'm trying to achive is to insert a digitial signature box/boxes into a listbox. The content is that a person would select a few groups that then need and then the javascript would then insert the required amount of digital signature boxs 

	AccessList.insertItemAt(cChoice, "s", 0);
	AuthList.insertItemAt("Director____________________________________" , "s", 0);
	AuthList.insertItemAt("Sign" , "s", 0);

	this.addField(cChoice, "signature");

the top 3 line works fine but i cant get the last line to work

i need some help please