question on HTML DOM Select Object

To clarify, the thing i'm trying to insert is,
http://www.w3schools.com/htmldom/dom_obj_select.asp


I have a table and i want to insert a select object into one of the cell. but i am getting a "Type mismatch" error on line with code "cell.insertBefore(selectBox);"


I am running IE 6

		var cRow = document.getElementById("displayCondition").insertRow(rowIndexDC++);
			
			if (rowIndexDC % 2 == 0)
				cRow.bgColor = "#cccccc";
			
			var cell0 = cRow.insertCell(0);
			var cell1 = cRow.insertCell(1);
			var cell2 = cRow.insertCell(2);
			var cell3 = cRow.insertCell(3);
			var cell4 = cRow.insertCell(4);
			var cell5 = cRow.insertCell(5);
			cell5.align = "center";
			
			if(rowIndexDC != 3) {
				var selectBox = document.createElement('select');
				
				var option = document.createElement('option');
				option.text = "And";
				
				try
			    {
				    selectBox.add(option, null); // standards compliant
			    }
				  catch(ex)
			    {
				    selectBox.add(option); // IE only
			    }
						
			
			} 	cell1.insertBefore(selectBox, cell1.childNodes[0]);

Code (markup):

 

Now why would you torture yourself like that?