I created a "SaveAs" toolbar button.....

I created a "SaveAs" Toolbar button like so:

//*********************************************************
How would you know that a button you created got clicked?

I created a "SaveAs" button where I do the following:

var FCKSaveAs = function()
{
}

FCKSaveAs.prototype.Execute = function()
{
//your code here
var name = prompt("Enter file name?", "File name here");
alert('You file name is:');

//tried seting INPUT ID="MyInputId" value to name but didn't work.
//document.getElementById('MyInputId').value = name;

//document.getElementById('MyInputId').innerHTML= name;
}

FCKSaveAs.prototype.GetState = function()
{
return FCK_TRISTATE_OFF;
}

// Register your command.
FCKCommands.RegisterCommand( 'SaveAs', new FCKSaveAs ) ;
var oFCKSaveAs = new FCKToolbarButton( "SaveAs",'Save As',null,FCK_TOOLBARITEM_ICONTEXT, true,true,1) ;

oFCKSaveAs.IconPath = FCKConfig.PluginsPath + 'SaveAs/SaveAsFile.gif' ;

FCKToolbarItems.RegisterItem( 'SaveAs', oFCKSaveAs ) ;
//***************************************************

I can get the promt and alert command to work fine. I am having a problem accesing a form on my main page where FCKEditor is. This form contains an Input field whos value I want to replace with my promp value i received. I tried adding:

document.getElementById('MyInputId').value = name;
and
document.getElementById('MyInputId').innerHTML= name;



Any ideas?

thanks.