thx Ken,

Your code works fine. however,  I have more than 1 editor which are in different tabpanel. different editor would have differnt screen size. How can I indentify each editor? and also I need to resize the editor screen when window.onresize happens. I actually tried to use following code which is provided by you in another replay. 

It is NOT working ~~~ Can you pls help

 

var editor1 = document.getElementById('<%= Editor1.ClientID %>');

function CuteEditor_OnInitialized(editor) {

if (editor1 != null) {

editor1.SetHeight(document.documentElement.clientHeight - 70 - 70 - 50);

}

}

window.onresize = function() {

if (editor1 != null) {

editor1.SetHeight(document.documentElement.clientHeight - 70 - 70 - 50);

}

}