ronbl,

 
Try put the following code in the end of CH_MainForm.aspx:

 if(chat_input.hasFocus())
 {    
    // Give focus back to the page
    var range;
    range = document.body.createTextRange();
    range.moveStart('textedit', range.text.length);
    range.collapse(true);
    range.select();
} 

 

Keep me posted