Hello,
I have already tried to fix this for version 2.1.7, the things you need to do:
1. Open the templates/<your templatename>/chat_send.tpl, and edit the line that says
<input type="text" autocomplete="off" name="chat_box" id="chat_box" size="30" maxlength="150" onkeypress="parent.window.Chat.typing();" />
Remove the maxlength="150" part, or edit the value of this parameter to your choice.
2. Open the class/js/chat.php file, and search the following code:
if (this.chat_message.length > 300) { alert('<?php echo($GLOBALS['lang']['str_too_long']); ?>'); this.chat_message = this.chat_message.substring(0,300); parent.window.chat_send.document.getElementById('chat_box').value = this.chat_message.substring(300, (this.chat_message.length - 300));}
If you want to completely remove the check for message length, remove it, otherwise, just edit the places where it says 300 to the new limit.
If you happen to have another version: You could try to do the same and ask me if it won't work out, or just say which version you have and I'll try to fix it for that specific version.
Please say if this has helped you.
Destro