ActionScript 3 :: Multiple Statements In For Loop (1084 Error)

I'm trying to do a binary search in a for loop. However, flash does not like the following for loop.
for(var select:int = Math.floor((min + max / 2)), var turns:int = 0;
turns < input.length / 2 + 1;
turns++, select= Math.floor((min + max / 2))){
if(input[select] > want){ max = select;
} else if (input[select] < want){
min = select;
} else {
return select;
}}

On the first line I get 1084: Syntax error: expecting identifier before var. I think I know why (I'm using , to separate the different statements), but how do I fix it? ; won't work since it's what the for loop uses.
( var select:int = Math.floor((min + max / 2)) ;
var turns:int = 0);
turns < input.length / 2 + 1; //etc
does not work either.