Detecting GuiText click

I have multiple GUIText objects in my title scene. When each of these is clicked, I want to allow the player to start the game, change options, and view the high scores, respectively. Since I have many GUITexts objects, I'd like to put the code to execute the scene transition in the Update() function of my scene controller rather than editing the OnMouseDown() function for each of the GUITexts. I've looked around for how to do this, but all the code I've come across involves Raycasting, which is for GameObjects not GUIText. Could someone please explain how to change scenes using the Update() function in my scene controller when a GUIText is clicked? Thank you!