I don't think this will work. You need to declare klima as array and not just variable.

Also Arrays start from 0 so you have to start as klima[0] instead of klima[1].

More, line:
Code:
if poruka[j+1]=klima[j+1] and poruka[j+2]=klima[j+2]and poruka[j+3]=klima[j+3] and poruka[j+4]=klima[j+4] then  gosub saljisms
maybe compiles less with this:

Code:
if poruka[j+0]=klima[j+0] then 
    if poruka[j+1]=klima[j+1 then 
         if poruka[j+2]=klima[j+2] then
            if poruka[j+3]=klima[j+3] then
                 gosub saljisms
            endif
         endif
    endif
endif