Format Currency - BRL

gistfile1.js

function formatCurrency( value ) {
  var exit = [];
	var i;
	
	value = parseFloat( value );
	value = value.toString().split("").reverse();

	for( i = 0; i < value.length; i++ ) {
		if( i == 2 ) {
			exit.push( "," );
		} else if ( ( i - 2 ) % 3 == 0 ) {
			exit.push( "." );
		}
        
		exit.push( value[ i ] );
	};
    
	if(exit[0] == "."){ 
		exit.shift();
	}
	return exit.reverse().join("");
}