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Selecting input element with jQuery in CKEditor
$(this)
 .parents("[role=tabpanel]")
 .prevAll("[name=info]")
 .find("label:contains(URL)")
   .next()
     .find("input")

dialog.setValueOf( 'info', 'txtUrl', newValue);

// get current dialog
var dialog = CKEDITOR.dialog.getCurrent();
// get the info tab in the dialog
dialog.selectPage('info');
// get the txtUrl element (found id using devtools plugin)
var tUrl = dialog.getContentElement('info', 'txtUrl');
// set this input box to by variable
tUrl.setValue(strLink);