diff --git a/etemplate/js/et2_core_common.js b/etemplate/js/et2_core_common.js
index 2582675975..f67710ab64 100644
--- a/etemplate/js/et2_core_common.js
+++ b/etemplate/js/et2_core_common.js
@@ -733,3 +733,35 @@ function et2_rangeSubstract(_ar1, _ar2)
 	return res;
 }
 
+/**
+ * Call a function specified by it's name (possibly dot separated, eg. "app.myapp.myfunc")
+ * 
+ * @param string func dot-separated function name
+ * @param arguments variable number of arguments
+ * @returns {Boolean}
+ */
+function et2_call(_func)
+{
+	var args = [].slice.call(arguments);	// convert arguments to array
+	var func = args.shift();
+	var parent = window;
+
+	if (typeof _func == 'string')
+	{
+		var parts = _func.split('.');
+		func = parts.pop();
+		for(var i=0; i < parts.length && typeof parent[parts[i]] != 'undefined'; ++i)
+		{
+			parent = parent[parts[i]];
+		}
+		if (typeof parent[func] == 'function')
+		{
+			func = parent[func];
+		}
+	}
+	if (typeof func != 'function')
+	{
+		throw _func+" is not a function!";
+	}
+	return func.apply(parent, args);
+}
diff --git a/etemplate/js/et2_widget_file.js b/etemplate/js/et2_widget_file.js
index 8ca0d34e06..7a844e4a0a 100644
--- a/etemplate/js/et2_widget_file.js
+++ b/etemplate/js/et2_widget_file.js
@@ -258,7 +258,7 @@ var et2_file = et2_inputWidget.extend(
 		this.disabled_buttons = $j("input[type='submit'], button").not("[disabled]").attr("disabled", true);
 
 		event.data = this;
-		if(this.options.onStart && typeof this.options.onStart == 'function') return this.options.onStart(event,file_count);
+		if(this.options.onStart) return et2_call(this.options.onStart, event, file_count);
 		return true;
 	},
 
@@ -268,7 +268,7 @@ var et2_file = et2_inputWidget.extend(
 	onFinish: function(event, file_count) {
 		this.disabled_buttons.attr("disabled", false);
 		event.data = this;
-		if(this.options.onFinish && typeof this.options.onFinish == 'function') return this.options.onFinish(event,file_count);
+		if(this.options.onFinish) return et2_call(this.options.onFinish, event, file_count);
 	},
 
 	
@@ -326,7 +326,6 @@ console.warn(event,name,error);
 				if(typeof response.response[0].data[key] == "string")
 				{
 					// Message from server - probably error
-					
 					$j("[file='"+name+"']",this.progress)
 						.addClass("error")
 						.css("display", "block")
@@ -349,9 +348,9 @@ console.warn(event,name,error);
 				.css("display", "block")
 				.text(this.egw().lang("Server error"));
 		}
-		if(this.options.onFinishOne && typeof this.options.onFinishOne == 'function')
+		if(this.options.onFinishOne)
 		{
-			return this.options.onFinishOne(event,response,name,number,total);
+			return et2_call(this.options.onFinishOne,event,response,name,number,total);
 		}
 		return true;
 	},