set Strings parts in different colors

Hi!

Is there a way to set guiText's or GUI.Label's String parts in different colors?

For example

 #pragma strict
 @script RequireComponent(GUIText)

 @HideInInspector    
 var str: String=Hi, Folks!; //need to access globally, but no need to show in Inspector
 
 private var guiT: GUIText;
 private var color1: Color=Color.red;
 private var color2: Color=Color.white;
 
 function Start()
 {
     // str's first two simbols are Red and Remaining ones are white
     guiT=guiText;
     guiT.text=str;
 }

Thanks in advance!

SCape.