Rails spinoffs - Apr 2008 - prototype.js $('element').getHeight() returning incorrect values

i''m trying to use the following function to "expand" the
element
that''s clicked on (in an unordered list) and "collapse"
it''s sibling
elements. this function is then called within another that shows/hides
the contents of the elements. In this case "sOpenObject" would be the
<li> you clicked on, "aClosedObjects" would be an array of
it''s
sibling <li>s (not including itself) and "sParentObject" would
be the
parent <ul>.

However, the getHeight() method is returning height values way off the
mark. Any ideas whay?

		function setSize(sOpenObject, aClosedObjects, sParentObject)
		{
			var totalHeight = sParentObject.getHeight();
			var closedObjHeight = 0;

			for(var i=aClosedObjects.length-1; i>=0; i--)
			{
				if($(aClosedObjects[i]))
				{
					$(aClosedObjects[i]).style.height=''auto'';
					closedObjHeight = closedObjHeight + $
(aClosedObjects[i]).getHeight();
				}
			}

			sOpenObject.style.height = (totalHeight - closedObjHeight) +
''px'';
		}


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