function col_width(id) {
	columns_size = 744;
	column_amount = $("#" + id + " .column").length;

	if ( column_amount == 1 ) {
		result = columns_size - 10;
		$("#" + id + " .column").width(result);
	} else {
		dividers = ( column_amount - 1 ) * 10;
		result = ( columns_size - dividers ) / column_amount;

		if ( result < 140 ){
			result = columns_size / ( column_amount / 2 + 1 );
		}
	}
	$("#" + id + " .column").width(result);
}