Search And Pass An Array And String And Replace The Value In Return

trying to write a function where i can pass an array and string and replace the value in return. i.e

var inputStr = "010203040506070809111213141516171819";

i want to pass this value in function and replace each number (number ranges are 01-09 and 11-19 only) i.e if i pass 01 want to replace that with A,02 with B etc.. so problem is i would pass input string and pass back as string after replacing those values by running through the below function. wrote the following,cant seem to split my inputStr into 01 02 etc tried splice and split no luck :

[Code]....