How to use string to substitude into a parameter ,look @ msg 4 more detail

How to use a screenname from an array of strings of screennames to set it to current screen
Example:
//screens
Form logo;
List cat,sub;
int back;//previous screen index
public String SCREEN[]={"logo","cat","sub"};
if (command=cmdBack) display.setCurrent(SCREEN[back]);
how???,i don't want to type in the screen name as i want it to be able to keep track of the screen displayed.
Please Help
thanks

hi...just one suggeation...u may like it ...
u can use a stack , as and when u view a screen push it onto the stack and with each press of "back" button u pop out . this way the back button functionality works perfectly no matter how u navigate between screens .
sanjib

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