Topic: Checkboxes not Checking in IE7?

shoppingCart['Update_Stock_Item_0_NRD%5FHAT2'] = {
				'propeller': {
								'label'          : 'propeller', 							
								'optionValues'   : {													
													 'on' : {
														'selected': 'selected'
															},
													  'off' : {
																'selected': ''
													          },
															'' : new String()
													}
							},
				'sunLogo': {
								'label'          : 'sunLogo', 							
								'optionValues'   : {													
													 'on' : {
														'selected': 'selected'
															},
													  'off' : {
																'selected': ''
													          },
															'' : new String()
													}
							},
				'MSLogo': {
								'label'          : 'sunLogo',
								'optionValues'   : {													
													 'on' : {
														'selected': 'selected'
															},
													  'off' : {
																'selected': ''
													          },
															'' : new String()
													}
							}							
	};

function stockInit() {
		alert("BEGIN: stockInit()");
		// TODO: You will recieve an "on" and an "off" option, 
		//       One will have a "selected" attribute of "selected",
		//       and the other will have a "selected" attribute of ""
		//
		// 		 The option that has the "selected" attribute of "" 
		//		 will generate a checkbox that is not checked.
		//
		// 	     The option that has the "selected attribute of "selected"
		//       will generate a checkbox that is checked.
		//  
		// 		 Why? You ask...because that's just the way the thing is 
		//		                setup.
		for(var item in shoppingCart)
		{
			// // console.log("processing item: " + item);
			
			var optionContainer = document.getElementById(item + "_optionContainer");
		
			for(var option in shoppingCart[item])
			{
				if(option != "blank")
				{
					// // console.log("option: " + option);
			
					var currentOption = shoppingCart[item][option]['optionValues'];
					
					// // console.log("currentOption['on']['selected']: " + currentOption['on']['selected']);
					// // console.log("currentOption['off']['selected']: " + currentOption['off']['selected']);
					
					// Really you only have to check the one, but just to be through-o
					var selected = (currentOption['on']['selected'] == 'selected') ? true : false;
					selected = (currentOption['off']['selected'] == 'selected') ? false : true;
					
					var label = document.createElement("LABEL");
					var labelText = document.createTextNode(shoppingCart[item][option]['label']);
					var optionInput = document.createElement("INPUT");
					
					var hiddenInput = document.createElement("INPUT");
					
					optionInput.setAttribute("type", "checkbox");
					optionInput.checked = selected;
					
					optionInput.setAttribute("id", option);
					alert(optionInput.id);
					alert(optionInput.checked);
					
					hiddenInput.setAttribute("type", "hidden");
					hiddenInput.setAttribute("name", option);
					hiddenInput.setAttribute("id", option + "_hiddenValue");
					hiddenInput.setAttribute("value", (optionInput.checked) ? "on" : "off");
					
					label.appendChild(optionInput);
					label.appendChild(labelText);
					label.appendChild(hiddenInput);
					
					(function(id)
					{
						optionInput.onclick = function() {
							
							var hiddenInput = document.getElementById(id + "_hiddenValue");
							
							hiddenInput.setAttribute("value", (this.checked == true) ? "on" : "off");
							alert("this.id: " + this.id);
							alert("this.checked: " + this.checked);
						}
					})(optionInput.id);
					
					optionContainer.appendChild(label);
										
					
				}
			}
			// // console.log("processing item of " + item + " complete");
		}
		alert("END: stockInit()");
	}

optionInput.defaultChecked