You can use the following method to detect the agent is online or not.

 

CuteChat.ChatWebUtility.HasReadyAgents()

 

For example, in the file CuteSoft_Client\CuteChat\Support-Image-Button.js.aspx:

 

function WriteLiveSupportButton()
{

 var ImageURL='<%= CuteChat.ChatWebUtility.HasReadyAgents()/*HasOnlineAgents()*/?URL_live_help_online_image:URL_live_help_offline_image %>';

 ImageURL= "<img title=\"support chat\" src=\""+ImageURL+"\" border=0>";

 // write the live support button to the page
 document.write('<a href=\"###\" onclick=\"OpenLiveSupport()\">'+ImageURL+'</a>');

}