How to tie a .NET OnClick event to FCKeditor's save button?

I'm using FCKeditor within my aspx page (ASP.NET 2.0 / C#). What I'm having trouble is with tying an OnClick event to the built in Javascript save button on the editor. Below is what I have prepared for the onclick event but I'm stuck on how to "sense" that the save button was clicked. Any ideas on how to achieve this?

public void editorSave_OnClick()
{
FCKeditor editor = (FCKeditor)FormView1.FindControl("FCKEditor1");
string s = HttpUtility.HtmlEncode(editor.Value);
BusinessLogicLayer.updateDB(s, System.Convert.ToInt32(Request.QueryString["id"]));
}