Replace comma with dot in a text layer expression

Hi!

I need to do a simple counter from 0 to billions so i found this expression that works perfectly:

//begin code

startTime = 0; //seconds

endTime = 5; //seconds

beginCount = 0;

endCount = 9700698977;

hasCommas = true;

function addCommas ( s ){

if( s.length <= 3 )

return s;

else

return s.substring(0 , 3) + "," + addCommas(s.substring(3, s.length));

}

function reverse( s ){

newStr = "";

for(i = s.length-1; i >= 0; i--)

newStr += s.charAt(i)

return newStr;

}

val = Math.round (linear(time, startTime, endTime, beginCount, endCount) );

if( hasCommas )

reverse (addCommas(reverse( val + "" )))

else

val

//end code

The problem is that i need to change the commas with dots to look like 9.700.698.977, anyone know how to do it?