var newModeWindow; 	
	var mWindows = new Array();
	function openChat(fromId,toId){
		if(fromId == ''){
		 	showlogindiv(window.location);
			return;
		}else if(fromId == toId){
			alert("自己不能和自己交谈!");
			return;
		}	
		
		var flag = false;
		for(var i = 0; i < mWindows.length; i++){
			if(toId == mWindows[i].name){
				mWindows[i].focus();
				flag = true;
				break;
			}
		}
		if(flag==false){
			var newModeWindow = window.open('/pages/webim/chat.jsp?fromId='+fromId+'&toId='+toId+'&openSource=active', toId, 'height=465, width=638, top=200, left=250, toolbar=no, menubar=no, scrollbars=no,resizable=no,location=no, status=no',true);
          	newModeWindow.focus();
          	mWindows.push(newModeWindow);
		}
	}