var keepAliveInterval = 300000; // 5 minutes
//var keepAliveInterval = 30000; //for testings

window.setInterval("PostToKeepAlive('ifrKeepAlive')", keepAliveInterval);

function PostToKeepAlive(keepAliveControl) 
{
   var ifrKeepAlive = document.getElementById(keepAliveControl);
   
   if (ifrKeepAlive) 
   {   
        var date = new Date();  
        var parameterValue = date.getTime();        
                         
        ifrKeepAlive.src = ifrKeepAlive.src.replace(/\?.*$/, '?' + parameterValue);
   }
}