By the way: If anyone wants the soultion for the post-question:
add anchoredBubbleClass to textLayer for closeBehavior without
changing html popup structure and showing only one popup at once
OpenLayers.Feature.prototype.popupClass = OpenLayers.Popup.AnchoredBubble;
OpenLayers.Layer.Text.prototype.markerClick = function(evt) {
var sameMarkerClicked = (this == this.layer.selectedFeature);
//does popups [OL array] exist AND was another marker clicked?
if(this.popup==null && !sameMarkerClicked
&& this.layer.map.popups && this.layer.map.popups.length > 0){
for (var i=0; i < this.layer.map.popups.length; i++) {
//yes - remove all popups [OL popup]
this.layer.map.removePopup(this.layer.map.popups[i]);
}//end for i
}//end if popup(s) AND marker
//does popup exist?
if (this.popup) {
this.popup.toggle(); //yes - toggle it
} else {
var myPopup = this.createPopup(true); //no - create one with closeButton
this.layer.map.addPopup(myPopup); //and add it to map
}//end if else this.popup
this.layer.selectedFeature = (!sameMarkerClicked) ? this : null;
OpenLayers.Event.stop(evt);
}//end markerClick
--
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