INDIRECT and convert cell name to number?

Hi all,
I'm facing an issue with INDIRECT function. I'm using it to display pictures depending on the cell value.

Rename A1 and A2 cell as cellone and celltwo
Then i insert 2 pictures for each cell
in C3 cell made a new value cellone
I did Define Name set up in formulas tab. Then wrote down name as PICTURES.
=INDIRECT(PICTURES!$B$2)

Then i insert one more picture and add a formula to it =PICTURES

Everything works fine. It displays picture depending on C3 value.

However i require that cell A1 and A2 would be a number example 251-5447 and excel doesn't allow it to do.

Is there a chance to change cell name to number?

Attached sample file..

Thanks

You could name the cells like
_251.5447

and then use
=INDIRECT("_"&SUBSTITUTE(Sheet1!$C$3,"-","."))
for pictures
You can then enter 251-5447 into c3