Hi st louis mo/gim-matt,

 

Find section below:

 

document.getElementById("imageFld").value = imgs[imgs.length-1].src;
            editor1.ExecCommand('new');
            document.getElementById("imageFld").focus();

 

Change to:

 

document.getElementById('<%=imageFld.ClientID%>').value = imgs[imgs.length-1].src;
            editor1.ExecCommand('new');
           document.getElementById('<%=imageFld.ClientID%>').focus();

 

Regards,

 

ken