Updated Sample code:

//Client-side 'onclick' function
function test(){
	var usrResponse = confirm('Are you sure you want to transfer this request to incident?');
   if(usrResponse == 'false'){
      return false;  //Abort submission
   }
   //Call the UI Action and skip the 'onclick' function
   gsftSubmit(null, g_form.getFormElement(), 'test'); //MUST call the 'Action name' set in this UI Action
}

//Code that runs without 'onclick'
//Ensure call to server-side function with no browser errors
if(typeof window == 'undefined')
   runBusRuleCode();

//Server-side function
function runBusRuleCode(){
   current.transf_inc  = true;
   current.update();
   gs.addInfoMessage('You did it!');
   action.setRedirectURL(current);
}