Hi all,
Assume you've got a table with dynamic contents and you haven't assigned any style or class name which specifies the width or height of the table. If u try the codes below u'll face the following results:

alert(document.getElementById("theTable").style.he ight);
 --> will alert:nothing(blank)
        alert(document.getElementById("theTable").currentS tyle.height);
 -->will alert:auto

alert(document.getElementById("theTable").style.pi xelHeight);
 -->will alert:0
        alert(document.getElementById("theTable").currentS tyle.pixelHeight);
 -->will alert:undefined

So what shall I do. It doesn't matter if it only works on IE...

As far as I know, a table's pixelHeight property will return 0 until you GIVE it the property.

That's exactly my observation which I also mentioned above but what else can I use to give me the current height of an object...

It is 3 days now and no one proposed any solution but I managed to find one after going up and down in msdn library. fortunatly it works as well in other browser other than IE:
object.clientHeight