Dynamically Add Elements (TextNode And DropDown Box)

This block for adding a text box works:
Code:
var secondCell = row.insertCell(1);
var el2 = document.createElement('input');
el2.type = 'text';
el2.name = 'ProjMemFName' + i;
el2.id = 'ProjMemFName' + i;
el2.size = 20;
el2.maxlength = 25;
secondCell.appendChild(el2);

But this block for adding a dropdown box isn't
Code:
var firstCell = row.insertCell(0);
var el1 = document.createElement('option');
t1=document.createTextNode("DBA");
el1.appendChild(t1);
el1.name = 'ProjMemTitle' + i;
el1.id = 'ProjMemTitle' + i;
el1.value = 'Team Mem #' + n;
el1.size = 20;
el1.maxlength = 20;
firstCell.appendChild(el1);

I get the TextNode, but not the dropdown box. I'm close, but trying to finish getting the syntax correct.