Adobe Extending Dreamweaver CS4 - Manual (Page 198)

192 EXTENDING DREAMWEAVER CS4
Toolbars
Example
function showif()
{
var retval = false;
var dom = dw.getDocumentDOM();
if(dom)
{
var view = dom.getView();
if(view == 'design')
{
retval = true;
}
}
return retval;
}