For loop not reading my var.

Hi All, I know this is a simple question but I can not get it to work.

I need my for loop to read my var. I am passing in lets say B. I trace it out so I know it is avaiable, but my for loop will not read it. Any ideas?

for (q = 0; q < myLetters_array.length; q++)
{
eval(X)+_groups_mc[myLetters_array[q]].gotoAndStop(1);
}

Thanks
B

more details, please?

I am passing in B as a string and assigning it to X. X needs to be appended to rest of the code. My for loop runs(because I trace() it out), but it will not read X. I don't know what else you need?

for (q = 0; q < myLetters_array.length; q++)
{
eval(X)+_groups_mc[myLetters_array[q]].gotoAndStop(1);
}


Thanks
B

Actionscript Code:

for (q = 0; q < myLetters_array.length; q++)
{
    _root[X+"_groups_mc"][myLetters_array[q]].gotoAndStop(2);
}

Works like a charm -- Thank you