Phil:

 

Please try this way :

 
var img=document.createElement("IMG");

var url=showModalDialog("CuteSoft_Client/CuteEditor/Dialogs/InsertGallery.aspx?settinghash=<%=Editor1.Setting.GetHashString()%>", img,"dialogWidth:670px;dialogHeight:650px");

if(url)
{
   //..
}

 

Regards , Terry .