don't try to call non-existent onLoad function

chrome/content/zotero/zoteroPane.js

@@ -89,6 +89,7 @@ var ZoteroPane = new function()
 	
 	var self = this;
 	var _loaded = false;
+	var _onVisibleHandlers = [];
 	var titlebarcolorState, titleState;
 	
 	// Also needs to be changed in collectionTreeView.js
@@ -114,6 +115,7 @@ var ZoteroPane = new function()
 		}
 		_loaded = true;
 		
+		ZoteroPane.restoreSavedState();
 		Zotero.setFontSize(document.getElementById('zotero-pane'))
 		
 		if (Zotero.isMac) {
@@ -311,6 +313,8 @@ var ZoteroPane = new function()
 			return;
 		}
 		
+		this.saveCurrentState();
+		
 		var tagSelector = document.getElementById('zotero-tag-selector');
 		tagSelector.unregister();
 		
@@ -335,7 +339,7 @@ var ZoteroPane = new function()
 				ps.alert(null, "", msg);
 				return false;
 			}
-			ZoteroPane.onLoad();
+			ZoteroPane.init();
 		}
 		
 		// If Zotero could not be initialized, display an error message and return
@@ -405,6 +409,8 @@ var ZoteroPane = new function()
 			}
 		}
 		
+		for each(var handler in _onVisibleHandlers) handler();
+		
 		return true;
 	}
 	
@@ -3414,4 +3420,49 @@ var ZoteroPane = new function()
 		}
 	}
 	
+	/**
+	 * Saves all attributes labeled as zotero-persist
+	 */
+	this.restoreSavedState = function() {
+		// load all z-persist attributes
+		var savedData = Zotero.Prefs.get("overlay.persist");
+		if(savedData != "") {
+			savedData = JSON.parse(savedData);
+			for(var id in savedData) {
+				var el = document.getElementById(id);
+				if(el) {
+					var savedDataEl = savedData[id];
+					for(var attr in savedDataEl) {
+						Zotero.debug(attr+" = "+savedDataEl[attr]);
+						try {
+							el.setAttribute(attr, savedDataEl[attr]);
+						} catch(e) {}
+					}
+				}
+			}
+		}
+	}
+	
+	/**
+	 * Restores all attributes labeled as zotero-persist
+	 */
+	this.saveCurrentState = function() {
+		var data = {};
+		
+		var zPersists = document.evaluate('//*[@zotero-persist]', document.getElementById('zotero-pane'), null,
+			XPathResult.ANY_TYPE, null);
+		var el;
+		while(el = zPersists.iterateNext()) {
+			var id = el.getAttribute('id');
+			if(id) {
+				data[id] = {};
+				
+				for each(var attr in el.getAttribute("zotero-persist").split(/[\s,]/)) {
+					data[id][attr] = el.getAttribute(attr);
+				}
+			}
+		}
+		
+		Zotero.Prefs.set("overlay.persist", JSON.stringify(data));
+	}
 }