rem: this.warn('Missing reference element'); 
add: this.warn('Missing reference element'); 
context: qx.Proto.positionRelativeTo = function(el, offsetX, offsetY){  if (el instanceof qx.ui.core.Widget) {    el = el.getElement();  }  if (el) {    var gecko = qx.sys.Client.getInstance().isGecko();    var loc = qx.dom.DomLocation;    this.setLocation(loc.getClientAreaLeft(el) - (gecko ? qx.dom.DomStyle.getBorderLeft(el):0) + (offsetX || 0),  	  loc.getClientAreaTop(el) - (gecko ? qx.dom.DomStyle.getBorderTop(el):0) + (offsetY || 0));  } else {    this.warn('Missing reference element');	    }}
meta: 1005	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/1005/90a3e3ba3d70d5e67497c64fc44e922eb7d25ac7/Popup.js/clean/qooxdoo/frontend/framework/source/class/qx/ui/popup/Popup.js