JavaScript question...simple to anyone who know JS

[Wokawidget]

I have a function:

function RebuildStartTimeDropDownCallBack()
	{
		var StartTimeIndex = document.main.StartTime.selectedIndex
                          'do some code
		document.main.StartTime.selectedIndex = StartTimeIndex
	}

However, I don't want to store, and restore the index.
I'd like to get the item data, and then select the combo item that has the same item data that I stored after I have done "Some other code". Item data is unique from a DB (Primary key ID)

Woka