To explain this let me give a simple example.  Lets say you have a cool module with a textbox on it (say txt1).  Lets say you plan on putting two of these modules on the page at the same time.  How can you distinguish one from the other?  Another example is lets say you have a textbox called txtName in your module.  How can you guarantee that no other modules will be added to that page that also doesn't have txtName in it. 

.NET handles these naming issues with naming containers.  When you place your module on a page, ASP.NET automatically generates a naming container for your controls. 

A common technique is to simply send down the naming container in a client variable (you can use the ClientAPI for this).   If all you need is access to one or two controls on the client, you can just send down the ctl.UniqueID.

Hope this helps.

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Tutunka,

I had exatly the same problem that you describe, and this was my solution i hope it helps:

1)Create a .js file in your module root folder containing the validation ("/DesktopModules/YourModuleName/MyScripts.js"). Like you can see I'm parssing the event's source element ID to get the DNN prefix. The button that detonates the event knows its own DNN id jejeje...

function BibliotecaBusquedaValidator(e)
{
    /*Get source element for FF & IE*/
    var targ
    if (!e) var e = window.event
    if (e.target) targ = e.target
    else if (e.srcElement) targ = e.srcElement      
   
    /*Get DNN Controls prefix*/
    var prefix = targ.id.replace("_SearchButton","");
   
    /*Find Control to validate*/
    var e = document.getElementById( prefix + "_txtWordsToFind");
   
    /*Validation*/
    if(e.value.length<3)
    {