function add_icon(icons) {	
	if(icons == ':nk>'){
		icons = ':">';	
	}
	if(icons == ':-nk'){
		icons = ':-"';	
	}

	var chat_content = document.frm_fullchat.txt_chat_box.value;
	chat_content = chat_content + icons;				
	document.getElementById("txt_chat_box").value = chat_content;
	return false;
}