checkInstalled = function(m) { 
	switch(m){ 
		case 'msn': 
			try { 
				new ActiveXObject("MSNMessenger.P4QuickLaunch"); 
				return true; 
			} 
			catch (e) { 
				return false; 
			} 
		case 'skype': 
			try{ 
				new ActiveXObject("Skype.Detection"); 
				return true; 
			}catch(e){ 
				return false; 
			} 
		case 'qq': 
			try { 
				new ActiveXObject("TimwpDll.TimwpCheck"); 
				return true; 
			} 
			catch (e) { 
				return false; 
			} 
	} 
}

function chatObj(obj){
	if(checkInstalled(obj) && navigator.userAgent.indexOf("MSIE")>0){
		return false;
	}else{
		return true;
	}
}

function autoSize(){
	var rightbox;
	var leftbox; 
	rightbox = document.getElementById("rightbox");
	leftbox = document.getElementById("leftbox");
	leftbox.style.height = rightbox.offsetHeight+"px";
  }